Showing posts with label mammal. Show all posts
Showing posts with label mammal. Show all posts

Wednesday, May 8, 2013

Black Bear (Ursus americanus) Visits my Yard

Few animals that live in the New England woods cause as much fear as the black bear. Black bears
Black bear (Ursus americanus)
Photo by Brad Sylvester, all rights reserved.
are indeed dangerous animals and should be avoided, but a little knowledge and common sense is really all it takes to prevent a black bear attack. A few days ago, I happened to hear a noise outside and discovered evidence that a black bear had just been present.

The evidence included a bent steel trash can with teeth marks in the lid, and bear paw prints on the side of our chicken coop. The steel can contained chicken feed and the lid was secured by several straps which the bear was unable to remove to gain access. I was able to get the trailcam set up the next day and to get a few pictures, both with the trailcam and a regular camera (taken from the doorway, a considerable distance away).

Let me caution you that what I am writing here applies to black bears only, other species such as grizzly bears and polar bears are much more aggressive and do attack and kill humans with a much higher frequency. Black bears seldom attack people as prey. According to Mass. Wildlife, there have been about fifty cases of black bears killing humans in predatory attacks between 1900 and 2008. Of these, only 13 took place in the 48 lower United States. It does happen, but it's very rare.

Most black bear attacks happen when a bear is conditioned to expect food from humans. If the bear thinks you have food, it may be quite insistent in trying to acquire that food. This may involve coming very close and physically trying to take the food, bluff charges designed to scare you away from the food, or outright attacks. The New Hampshire Fish and Game Dept. cautions that a fed bear is a dead bear. Feeding a black bear is not a kindness, it is just setting the bear up for conflict with humans in the future, conflict that may result in a human injury, but most often results in the death of the bear.

Leaving bird feeders out in bear country once the snows melt is the most common way that people run into trouble with black bears. Black bears are omnivores, they'll eat almost anything from birdseed and garbage, to wild berries, small animals and carrion. They will also kill and eat chickens.

I have a chicken coop that is built to be bear-proof. While I don't doubt that a very insistent bear could get in if allowed to work on it for an extended period of time, it is made tough enough to discourage the bear and provide no quick rewards for his effort.

I bought this house in the woods because I like being surrounded by wild animals. I don't mind an occasional visit by a black bear, but I definitely do not want to encourage the bear to frequent my house or any other human habitation. That means making sure that everything that might provide the bear with a meal is securely locked away before dusk. We have hummingbird feeders that are brought inside each evening. I moved the chicken feed barrel to the inside of the garage, and I make sure the chicken coop is securely closed and locked by sunset each day.

The result is that the bear visited our yard for four nights in a row, but has only been back once in the two weeks since that initial string of visits. I can only hope the neighbors are being as cautious. I live near Little Blue Job Mountain which is covered in blueberry bushes. In the summer, the blueberry fields area strong attractant for black bears. Although I haven't seen them, I am told that if you visit the top of the mountain around 5:00 a.m. and clap your hands, as many as five or six bears will rear up from around the fields to see what made the noise. Once the blueberries come in July, I don't expect we'll see any hungry bears searching for food in our yard.

Meanwhile, when going out into the yard at or after dusk, I check for bears and make some noise to alert any that might be unseen to my presence. According to one study, black bear attacks occur most frequently when a human shows fear or weakness by such actions as running away. Prey runs away. If you run from the bear, the bear knows that it has nothing to fear from you and can attack with impunity. The second most likely circumstance for a bear attack is when a human behaves with indifference toward a bear's presence, just going about one's business as if the bear weren't there. In my opinion, this causes anxiety to the bear. You're not afraid of it, so you might be dangerous, but you're not attacking so perhaps an aggressive tack by the bear might drive you away. If you are acting indifferent to the bear, you may turn your back to it or present some other opportunity for it to take you by surprise.

The fewest black bear attacks occurred when the human took an aggressive stance. Never turn your back on the bear. Face it, back away slowly and carefully. Stay in a group, if possible. Black bears will often try to gauge your strength by pretending that it is going to attack and seeing if you bolt and run. A loud snort may precede a bluff charge. If you turn and run, you'll invite attack. Instead, stand your ground, try to appear as big as possible by raising your arms over your head, yell, and have any weapon you can find handy- a stick, a rock, a camera tripod, or anything you can use to strike the bear. If the bear does initiate an attack, hit it as hard as you can as many times as you can. Fight furiously to demonstrate that the bear will risk pain and injury if it continues to attack. Keep fighting for as long as it takes. Black bears don't often stop attacking when an adversary plays dead. Your odds are better fighting back.

Of course, that's a last resort, the bear is much more dangerous than you. Avoiding conflict is always the best course of action. When walking in places where there may be bears, make noise so any nearby bears will not be surprised. If you see a bear, do not approach it or turn your back. If a bear is near a dead animal upon which it has been feeding, it may actively defend the area. Give a very wide berth to any bear that doesn't immediately flee. Pay attention to the bear's body language. Often you can tell if an animal is agitated. Increasing the distance between you and the bear generally helps calm it while getting closer increases its alarm.

Most black bears will avoid human presence. The exception is when there is food in the area. This can be carrion, berry bushes, the smell of hamburgers cooked on your campfire, the sandwich in your backpack, or the bird feeder on your deck. Black bears are generally calm creatures, but they really don't like it when food is taken away from them or they are prevented from getting to food they know is present.

Quick Facts about the Black Bear (Ursus americanus)

Where do black bears live? According to National Geographic, black bears might travel a range of 25-80 square miles, which may well overlap with the territories of other black bears.

When is it here? Black bears are here all year round, although they will usually stay in their dens in a strong winter torpor. Despite popular opinion, black bears do not hibernate as deeply as some animals and may wake if disturbed during the winter. They may lose a quarter of their body weight during the winter and are quite hungry when they emerge in the spring, often searching out easy meals like bird feeders.

Life Cycle: A black bear will usually have two to three cubs which are born in the winter den. As the mother bear languishes in winter torpor, she will nurse the cubs until the snows melt and it warms enough to leave the den. The cubs will stay under the close protection of the mother bear for about two years.

What is the lifespan of a black bear? National Geographic says the average lifespan of a black bear in the wild is 20 years, but the average may be considerably less in areas where they are actively hunted.

How big do black bears get? Although they can get as heavy as 600 pounds, that is an exceptionally large bear, especially for New England. A very large adult here may be about 400 pounds with 250 pounds being the more common upper limit for an adult male in New Hampshire. Females may be half the size of a male. Adult black bears are about five to six feet in length (nose to tail). Black bears may be about three feet tall from the ground, but can rear up on their hind legs to more than double this height, especially to reach food like a bird feeder hanging from the eaves of a house. Bird feeders above eight feet high are generally safe from a bear, although the bear can smell birdseed from a mile away and may be attracted to the area even if it can't reach the feeder. Spilled seed on the ground may be enough to keep it coming back night after night.

What do black bears eat? The short answer is almost anything. The long answer is insects (including wasps and bees), small animals, grasses, berries, fruit, seeds, most human food, garbage, carrion, honey, and pet food.

Appearance: A black bear's coat is generally black, but may be a very dark brown. A black bear may or may not have a white patch on the underside of its chest. The muzzle tends toward brown regardless of the bear's main coloration. Black bears blend into shadow very well and are extremely difficult to spot in the dark, especially if they are holding still.

What do bear tracks look like? Black bears have five toes with non-retractable claws. (See the photos below.) The rear foot is longer and almost human shaped. An adult hind foot print may be roughly eight inches long, give or take. The front footprint is shorter, lacking a defined heel and may be 4-5 inches in length. Bear feet are wide, about five inches from side to side. Depending upon the type of ground, claw marks may be present in front of each toe. In soft dirt or dust, fur marks may be visible around the outline of the foot.
 
Bear prints indicated by black arrows. Raccoon and coyote
prints are also evident on the side of our chicken coop.
Photo by Brad Sylvester, all rights reserved.
Bear track in dried mud about two miles away from my yard.
Photo by Brad Sylvester, all rights reserved.
 

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Monday, June 11, 2012

Revisiting Old Friends: Eastern Chipmunk (Tamias striatus)

Eastern chipmunk at burrow entrance
Photo by Brad Sylvester, copyright 2012
For me, one of the best things about learning what lives in my yard, is that I can easily recognize things I couldn't identify before. Another benefit of this effort is that over time I can see the same creatures in different places, seasons and situations and really get to know them in more depth.

This morning, I was sitting on a small footbridge that I built over a stream that leads into the forest in my backyard photographing a new insect for this blog. As I pulled my eye away from the viewfinder after taking some macro shots, I noticed that I was under observation.

Eastern chipmunk (Tamias striatus)
Photo by Brad Sylvester, copyright 2012
A small brown furry head was peaking up from between some rocks about four feet away from me. Of course, anyone in New England can readily identify a chipmunk. Some may know that it is actually called the Eastern chipmunk or that its Latin species name is Tamias striatus. I didn't learn this particular species, or much new information about them when I initially described the Eastern chipmunk in this blog last July.

Those who read that post may remember that the chipmunk lives in underground burrows that measure from 5-10 feet in length with one or more living and storage chambers. Knowing this, when I saw the chipmunk watching me from between two rocks near a stream, I suspected that it was sitting right in one of the entrances to its burrow.

The small hole in the center of the picture
is the entrance to a chipmunk burrow.
Photo by Brad Sylvester, copyright 2012.
After snapping a few pictures of the chipmunk, I saw it turn and disappear into the cleft between the rocks where it had been sitting. As I suspected, this was the front door of its underground home. So I'm able to add a few extra pictures of the Eastern chipmunk and one of its den.

Quick facts about the Eastern chipmunk (Tamias striatus):

Lifespan: Eastern chipmunks live 2-3 years on average in the wild according to National Geographic.

When is it here? Eastern chipmunks live in New Hampshire all year round, but will remain below ground in their burrows during the cold winter months.

Nature's Hoarders

The Eastern chipmunk is a hoarder. It collects food all summer long, carrying it back to its burrow in preparation for the winter. The chipmunk does greatly reduce its activity level during the cold months, but doesn't go into a full hibernation. The food stored in its burrow sustains the chipmunk through the winter.

Tree Climbing

Although the chipmunk lives underground and generally forages on the forest floor, it is a quick and agile climber and will quickly scamper up a tree and sound a warning if threatened while away from its den.

Hand Feeding Chipmunks

Chipmunks are readily acclimated to humans by food offerings, and will take peanuts or similar food from the hand if food is given and gradually moved closer and closer to human presence. This is not recommended because it can lead to reliance on human feeding and selection of foods that have improper nutrition and resistance to spoilage to keep the chipmunk alive through the winter. It can also lead to chipmunks becoming a nuisance as they learn to associate people with food. Not to mention the fact that they can and will bite if startled or threatened and can carry serious diseases.

Tuesday, February 7, 2012

A Bull Moose (Alces alces): The Biggest, most Dangerous Animal in my Yard

Yearling Bull Moose (Alces alces) with spike antlers taken
in my backyard on February 6, 2012.
Photo by Brad Sylvester. Copyright 2012.
Sometimes I have to go to great lengths to find the animals that live in my yard, but when a bull moose (Alces alces) walks through the yard within 50 feet of the house, it's pretty hard to miss. This moose is definitely male, because it has antlers. Female moose do not grow them at all. Bull moose actually shed their antlers and regrow a new set each year.

The little spiky antlers on this moose tell me that it is almost certainly a yearling moose. Yearlings may keep their antlers later in the season than their more mature brethren who may drop their antlers around December. February or even March is not too unusual a date to see such a young moose still carrying last year's beginner antlers. You can tell that these are antlers from the prior season rather than newly developing antlers by the lack of velvet covering over them. In the pictures, the antlers of the moose that was in my yard appear hard and bony.

Moose Antler Growth

Bull moose showing developing antlers with brown velvet
feeding on aquatic plants in Errol, NH in July, 2011.
Photo by Brad Sylvester. Copyright 2011.
They would start out as buds around the end of April and begin growing with a brown, fuzzy covering called velvet. The velvet peels and gets scraped off on trees to relieve the itching as the antlers get ready for rutting season. The picture below shows a bull moose in July with his antlers coming in. The velvet shows clearly. You'll also notice that even though they are not nearly finished growing for the season, they are clearly going to be much, much fuller than those of the moose from my yard. This shows that the bull moose in the picture I took last summer in Errol, is older. You can see the full video of this adult male moose eating here. According to the New Hampshire Fish and Wildlife Service (NH F&G), the antlers of a mature moose may weigh 40 pounds.

Bear Killers

Even though it is still young, the yearling moose stands 6 feet tall at the shoulder and about eight feet tall overall. Moose are big animals. Already, this moose weighs more than a typical full grown black bear. During the fall mating season when it is full of hormonal aggression, it is also more dangerous than a black bear. The most dangerous moose, however, is the female with a young calf. They are fiercely protective and can not tolerate any creature physically getting between them and the calf. The NH F&G website claims that female moose have been known to kill not only people and black bears, but also the larger grizzly bear while defending their calves. These are very dangerous animals.

Although a female moose isn't as big as a male, an average adult moose weighs 1000 pounds and big bulls may go as high as 1500. The North Country News says that the largest female moose taken by hunters in New Hampshire was about 1100 pounds estimated live weight, while the largest bull taken in the Granite State would have tipped the scale at an estimated live weight of 1400 pounds.

Bull Moose trotting off down into the forest in my
backyard.
Photo by Brad Sylvester. Copyright 2012.
That makes the moose the biggest wild land animal not just in my yard, but in all of New Hampshire by a wide margin although cattle may weigh more. Despite its great size, moose are vegetarians eating leaves twigs and buds of trees during the winter and aquatic plants during the summer. Their noses close up to prevent water from getting in while they stick their heads underwater to graze.

There is a large marshy area in the valley below my house, perhaps a mile and a half away. This would be ideal summer grazing territory for moose while the forests make good winter habitat. Moose are excellent swimmers. Having watched one swim across a lake, I think I'd be pretty hard-pressed to out swim a moose for very long. On land, however, there's no question; the moose easily wins with a running speed that can top out around 35 miles per hour.

Moose Scat


Old moose scat from the woods at the back of our property
Photo by Brad Sylvester. Copyright 2011.
 About a month ago, I found moose scat down on the back part of my property, but it appeared to be at least a year old. Because it contains mostly woody material from the moose's winter diet, moss was actually growing on it. It looks a bit like compacted sawdust. Each pellet is about an inch long, much bigger than deer pellets. When we first moved here about 4-5 years ago, I saw a very young moose crossing the road about five miles away and we have seen moose tracks in the snow within a mile of our house, but this is the first time we've seen a moose on our property. Here's a video I took of a very young moose with its mother in Northern Maine.

The two depressions behind the print on the left are from
the dew claws of the hind foot of the moose.
Photo by Brad Sylvester. Copyright 2012.
After giving the moose in my yard a head start of about an hour, I followed its tracks through the woods in my backyard for over a mile onto a neighbor's property and into a protected wilderness area on the other side of that. I was curious to see where it went, but couldn't devote the entire day to following it; perhaps another time. I did find one hair from the moose's coat stuck on a tree branch that it pushed aside as it walked through the forest. You can see from the photo below that it is much thicker than a human hair placed next to it for comparison.

Moose tend to be solitary creatures. With the exception of mother and calf, and during the rutting season (mid-September to mid-October), they will most often, though not always, be spotted alone.

Moose hair on right,
human hair on left.
Photo by Brad Sylvester.
Copyright 2012.
Moose Tracks

Moose tracks are also big. They tend to have obvious dew claw marks in the snow, especially on the rear feet. The tracks from the moose in my yard measured six inches long without the dew claws, nine inches with them. They were 5.5 inches wide. Like deer prints, if the moose is running or trotting then the front part of the hoof will tend to be splayed open with more space in between the two halves.


The red arrows point to the dew claws at the back of
each hoof. The dew claws of the rear feet tend to show
up more prominently in the moose tracks.
Photo by Brad Sylvester. Copyright 2012.
 The stride of this moose varied from about three feet to about seven feet between prints depending upon the speed at which it was traveling. The rear prints tend to fall directly on or very near the front hooves, leaving a track pattern not unlike the one that a person would leave with left and right prints alternating.

Quick Facts about the Moose (Alces alces):

Diet: Moose eat twigs, leaves and buds from trees, especially during the winter. In the summer, they prefer grazing on aquatic plants pulled form the bottoms of shallow lakes, rivers and marshes.

Habitat: Forest and marshland.

When is it here? The moose lives in New Hampshire all year round, but may move from forest to marshland depending upon the season.

Home range: From 1-25 square miles according to NH F&G.

Where does the moose go during the winter? The moose will forage in the forest or at the forest edge during the winter. It is not bothered by cold, unless its coat is damaged or worn off by scratching (such as might be caused by a tick infestation).

Life Cycle: Moose mate from mid-September to mid-October. 1-2 calves will be born in late May or early June. The calves are cared for by their mother for about a year. Females are ready to mate during their first year while bulls take a few years to grow big and strong enough to challenge for the right to mate by clashing antlers with other rutting males.

Moose Lifespan: Moose typically live 10-15 years.

Moose taxonomy:
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Cervidae
Subfamily: Capreolinae
Genus: Alces
Species: Alces alces




Friday, February 3, 2012

To catch a deer mouse (Peromyscus maniculatus)

Notice the bicolored tail, dark above, white below, on the
deer mouse (Peromyscus maniculatus)
Photo by Brad Sylvester. Copyright 2012.
There are a number of different species and subspecies that are popularly called deer mouse, wood mouse, or white-footed mouse. Many have a similar appearance and if you just catch a glimpse of one or are just looking at a top view as it sits in a bucket waiting to be carried far away from the house, then it can be hard to tell the difference between them. This appears to be a deer mouse of the species Peromyscus maniculatus.
One of the best websites detailing the differences between the deer mouse and similar species is enature.com. The tail is one key point of identification. In Peromyscus maniculatus, the tail is dark above and light below. There’s a clear demarcation of the two colors on the tail which should be about the same length as the rest of the mouse. The bicolored tail is shown clearly in the photo at the top left of this post.

The white underbelly with the tail details, the color of the top of the mouse’s body, the large, bulging eyes, and the location where it was found (New Hampshire) make it a pretty sure bet that this is, in fact, Peromyscus maniculatus, even though there are four species of mice that are native to New Hampshire and one (the house mouse – Mus musculus) that was introduced from Europe and is now firmly established here and throughout North America . If you look up images of the species by the common name on the Internet, however, odds are about fifty-fifty that you’ll get something other than Peromyscus maniculatus.

Deer mice typically live in the forest and fields and do quite well without coming into human houses during the winter. They will burrow under the snow seeking seeds and other edible plant material. In my yard, they will eat the soft green bark of bushes and shrubs below the snow so the damage isn’t visible until the snow melts in the spring. Once the snow does melt, however, the gnaw marks are very clear often girdling the bush (removing the bark all the way around it), which kills the plant.
From the top, not enough distinguishing features can be seen
for a positive identification of the deer mouse (Peromyscus
maniculatus).
Photo by Brad Sylvester. Copyright 2012.

We do, however, get an occasional mouse inside the house when there is a period of particularly cold or severe winter weather. They come in seeking better shelter and a more ready source of food.
Mice are prolific breeders. Just a couple slipping into the house can turn into an infestation if not quickly eliminated. Once inside, they’ll also look for whatever foods they can find there: dog food, cat food, my food.

For that reason, and because the area in which we live has carpenter ants which would like nothing better than to chew up the structural wood of our house until it falls down around our ears, our house is serviced regularly by an exterminator. They bait for rodents in the crawl spaces and little nooks and crannies where they might be otherwise found. This is quite effective and we generally don’t have mice around, at least not for very long.

Outside, however, there are the tunnels in the snow that reveal their presence and favored routes. To catch one, I just needed to put this live capture mouse trap , baited with peanut butter, in the walkway near the opening to one of the snow tunnels.   That's what led to the photo opp. for this little guy. This deer mouse was released unharmed.

Quick Facts about the Deer Mouse (Peromyscus maniculatus):

Diet: The deer mouse eats seeds, insects, berries, nuts and mushrooms. The US Forestry Service doesn't list the green inner bark of shrubs as part of the deer mouse diet, but I have the dead ornamentals to prove it, although they don't seem to choose it when other food is available in the summer. Since they seem to only eat it when it is under the snow, it is hard to catch them in the act. In this case, however, the tunnels, footprints, and captured deer mouse itself provide pretty solid evidence that this is the species that is eating the bark. 

Range: According to US Forestry Service, the deer mouse lives pretty much all throughout the continental United States except the extreme southeast (northern Georgia yes, Florida no). It can also be found in parts of Mexico and Canada west to southeastern Alaska.

Habitat: Deer mice live in just about every type of habitat: forests, fields, scrub, canyons, desert, you name it. They build nests just about everywhere, too. Deer mouse nests can be found high in trees, in underground burrows, in scrub piles, rock piles, and all sorts of man-made structures (like houses, cars, and barbecue grills) where they can stuff leaves, grass and other soft insulation to make it more comfortable.

Reproduction: Litter sizes may range from one to nine, but three to five is more typical. Gestation lasts 22-26 days and females may have several litters each year. The US Forestry site says that as many as 14 litters in a single year have been reported. At about 48 days of age, female deer mice are sexually mature and ready to begin having litters of their own.

When is it here? The deer mouse is a year-round resident of New Hampshire.

Where does it go int he winter? The deer mouse does not hibernate and is fully active throughout the winter.

Territory:

Predators: What eats deer mice? Many New England animals eat deer mice. The owl, coyote, fox, bobcat, house cat, snakes, weasels, martens, fisher cats, mink, chickens, and even skunks will all eat deer mice either regularly or opportunistically. With so many predators, the deer mouse relies on frequent litters and rapid maturation to maintain its population.

Deer Mouse Taxonomy:

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Genus: Peromyscus
Species: Peromyscus maniculatus


Sourcing Note: Because the range of the deer mouse covers such a wide variety of climates and geography, there are variations in reports of diet, litter size, litter frequency and other aspects of behavior among different sources. They may all be correct for different regions, but I have used data from the US Forestry service website linked above for information that I have not directly observed myself.

Tuesday, January 17, 2012

Porcupine Dens in my Yard Confirmed by Trailcam

A porcupine heads out for a snack in the dark of night. The
grizzled white areas on it's back and tail are the areas of
heaviest quill concentration.
Photo by Brad Sylvester. Copyright 2012, Do not copy.
In my previous entry, I wrote about a path of footprints leading out from two holes in the ground in the forested part of my yard. Well, for each of the last two nights, my trailcam has captured pictures of the creatures that are using the underground dens to escape the winter cold. As I suspected, they are porcupines or taxonomically speaking, Erethizon dorsatum.

The resolution of the camera is not high enough to tell for certain how many individuals are living in the dens, but from size differences of those porcupines photographed, I would say there are at least three. At least one is much smaller than the others and was probably born this past summer. I have known that porcupines lived on my property for some time, but I did not know they had a den here. Indeed, it may be only a temporary den for the winter as I have never seen tracks or other signs of porcupine occupancy there prior to last week.

Although generally nocturnal, it's not too unusual to
see procupines during daylight hours. This one, shown
disappearing into its den, was active in the middle
of the afternoon.
Photo by Brad Sylvester. Copyright 2012. Do not copy.
Porcupines are generally nocturnal feeders, but can be found out and about during daylight and dusk from time to time as well. As I mentioned last time, they don't hibernate or even fall into a winter torpor. Their thick coating of hair and quills provide them with insulation and there primary foods are available all year round.

Porcupines can cause terrible injury in dogs or any animal that attempts to touch them, but they are one of nature's best examples of a passive-aggressive creature. Porcupines respond to threats by turning away and slowly walking off as if they have no care in the world. In reality, their tails and backs are where their quills are thickest. Any attack from the rear is almost certain to result in more pain and injury to the attacker than to the porcupine. If the attacker gets too close for comfort, the porcupine will flick its quill-covered tail at them and do its best to turn the attacker into a pin cushion.

Porcupette Video. Copyright Brad Sylvester 2012
Porcupine quills have a very sharp point at the end and have small, scale-like barks that prevent them from being easily backed out once the penetrate the skin. Instead, they actually work themselves deeper over time. Porcupine quills can be quite painful and may result in serious infections if not removed and the wounds treated.


A porcupette looks down from an overhead branch. The
rodent's chisel-like incisors are visible.
Photo by brad Sylvester. Copyright 2010. Do not copy.
 Despite this defensive armament, the porcupine does fall victim to several New England forest predators on a regular basis. The most accomplished porcupine hunter is probably the fisher cat. I've been told that fishers attack porcupines in one of two ways. They'll harry the porcupine using their own speed and agility to stay out of reach. The fisher attacks the porcupine's head until the porcupine is completely exhausted (or dead) and can no longer turn its back fast enough to defend itself. Then the fisher will flip the porcupine over and eat from its unprotected underside. Another technique is to attack a treed porcupine from below as it clings to a branch. From that angle, its unquilled belly is exposed. I haven't seen either of these behaviors to confirm these modes of attack, but that's what folks around here say.

Trailcam video. Copyright Brad Sylvester 2012.
Bobcats and coyotes are also known to kill and eat porcupines as well. The head is largely undefended and frontal attacks against the porcupine are the least dangerous for the attacker. We have all three porcupine predators in New Hampshire and both bobcats and coyotes have been present on my property on more than one occasion since I moved here in 2007.

Quick Facts About the Porcupine (Erethizon dorsatum)

Size: Porcupines are the second largest rodent in North America. Only beavers are bigger. Adult male porcupines can weigh 35 pounds or more, but 12-15 pounds is a more common adult weight. Porcupines may measure more than three feet long and over a foot tall at the shoulder.

Lifespan: up to 15 years in the wild

Diet: Mainly the soft inner bark of trees, young evergreen needles, and plant buds. Hemlock is a favorite. In the spring and summer, porcupines will also eat grass and other green plants, fermenting fruit, seeds and some tubers. They are also known to chew treated wood or even rubber for the salt and mineral taste and may become a nuisance by eating the bark of fruit trees, sometimes girdling branches or the trunk and killing them. As a child, I remember hiking the Long Trail in Vermont and often finding porcupines chewing away contently at the wooden lean-tos built along the trail by the Forestry Service.

Where does it live? Porcupines live throughout the northern United States and Canada. According the IUCN information page, it can also be found further south in the west, even into northern Mexico.

Habitat: Porcupines most often inhabitat mixed forests, but in the spring can be found feeding on grass in open fields, especially when they are caring for a young porcupette. In the southwest, says the IUCN, they may live in desert scrub. Further north, they also live in the Canadian tundra.

When is it here? The North American porcupine lives in New Hampshire all year round?

Where does it go in winter? No place special, the porcupine does not hibernate or fall into a winter torpor. If the weather is especially cold or severe, they may form communal dens for a time during the winter, leaving each night to feed.

Breeding: Porcupines mate from September to December. They give birth usually to a single baby about seven months later. Males often fight viciously and noisily over females during mating season.

IUCN redlist status: Species of least concern. Wide distribution and large population.

Notes of interest: Each porcupine has over 30 quills. Baby porcupines are called porcupettes. Porcupines are very good climbers, but slow and awkward on the ground.

Porcupine Taxonomy:
Phylum: Chordata
Class:  Mammalia (Mammals)
Order: Rodentia (Rodents)
Family: Erethizontidae
Genus: Erethizon
Species: Erethizon dorsatum
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Update: My new YouTube channel: @WhatLivesinmyYard talks about the porcupine in Episode 1.

Sunday, January 15, 2012

Hole in the ground becomes winter den

This hole goes as deep as I can see, twisting around
underground boulders. Now it appears that porcupines are
using it for a winter den.
Photo by Brad Sylvester. Copyright 2012. Do not copy.
During the summer, I found a deep hole in the ground in my backyard forest. It's right at the base of a tree and if you peer into it, you can see about six feet down although there are numerous very large stones (two foot diameter or more) causing the hole to twist and turn as it descends. It seems to go much deeper. At any rate, it's well below the frost line for New England which is somewhere just under three feet as I recall from my study of architecture in high school.

Two days ago, we had about three inches of snow and I happened to walk through the part of my yard where the hole is. There was a very well-trod path coming out of the hole and proceeding about 15 feet to another similar, but smaller hole, in the ground. From there, the path continued on and split. One fork went to the base of a nearby pine tree, straight to the trunk. From the tree, it appeared as though it came straight away from the trunk and continued into the forest.

The tracks seemed to show that the path went up the tree and came back down before continuing. The paths were very well traveled as I mentioned. So, it was impossible to make out individual prints to see what creature or creatures had made the trail. There was no scat or other evidence to help determine what might be using the dens.

Today, I went back to install my trail cam in a position to catch photographs of whatever it is. There was new evidence. Urine and scat right outside the holes in the ground suggested that it might, indeed, be what I suspected. A communal den of a fairly common New England mammal that does not hibernate in the winter: the porcupine.

Communal Porcupine Dens
Second suspected porcupine den located just 15 feet from
the previous one. One trail leads to the other opening,
and one leads further into the forest.
Photo by Brad Sylvester. Copyright 2012. Do not copy.
Porcupines generally have solitary or family dens, but in periods of severe winter weather, they may group together in a single den which benefits them all by the sharing of the communal body heat. I believe these two holes in the ground are communal porcupine dens. Today, I placed my trail cam in a position where it will almost certainly get some good identification photos of whatever is spending its days in these holes.

Which brings us to the question of why don't porcupines hibernate or go into a winter torpor like so many other small mammals. I would guess that it has to do with the preferred diet of porcupines. They eat the small, tender twigs of evergreen trees, green bark, and the young evergreen needles. They especially like hemlock. Of course, as the name says, evergreen trees stay green and full of porcupine nutrition throughout the winter. There is no need, therefore, for a porcupine to shut down its metabolism and wait for the new growth of spring. They will also eat fallen fruit when it is available.

Signs of Porcupines

As an aside, there are two sure signs of porcupines. First, lots of bits of the ends of hemlock branches littering the forest floor under the tree. The porcupine climbs out on the branches to eat the small twigs and to reach the newest needle growth. It eats the needles from the small twigs, but as it does so, the branch tips are discarded and fall to the ground. Porcupines, being both lazy and creatures of habit, will revisit the same few trees over and over again around its den, relying on the growth of those trees, especially during the spring and summer months to keep the porcupine's plate full.

Porcupine Droppings
The second sure sign of porcupines, is an excess of droppings outside of a ground level tree hollow, small cave or other suitable den entrance. Porcupine's are not meticulous about the placement of their droppings. Very large piles of droppings of varying ages will, therefore, accumulate outside the entrance to a porcupine's den over time. As they walk through it several times a day, trailing their dragging tails and quills, they will form a stained trail into and out of the den. On the positive side, the scat is made up almost entirely of undigested cellulose lacking in strong odor. Procupine droppings are a bit like rounded, oblong deer droppings, but tend to have a pronounced curve, making them almost "C" shaped. Other than outside the den where they accumulate, they'll be present in much smaller piles than deer droppings, or even individual pellets.

A trail leading straight into a tree trunk and then away
indicates an animal that climbed up the trunk such as
a squirrel or porcupine. These tracks are too big for
a squirrel.
Photo by Brad Sylvester. Copyright 2012. Do not copy.
Porcupine Winter Behavior

As long as a porcupine can withstand the cold temperatures or winter, they can find plenty of food to sustain them even in the deepest snows of winter. By grouping together during the coldest weather body heat of many porcupines is combined to raise the ambient temperature of a den, which may be underground or in a large tree hollow. Together they can keep the temperature in the den much higher than any individual could by itself. That means fewer calories need to be burned to stay warm. In extreme conditions, it means the difference between surviving and freezing to death.

Of course, when it comes to the "whys" of animal behavior, we can only make assumptions based on the available evidence. There may be some other reason for communal dens during the harshest part of the winter, but Occam's Razor says that we should first assume the simplest explanation is correct until additional evidence disproves it.

I'm actually very excited to find dens of any mammal in my yard because it offers the possibility of regular and close observation of the den's occupants to learn more about their behavior than I might learn by simply catching pictures of them visiting feeding stations or walking along a common game trail.

Hopefully, one or more of the porcupines, assuming I am right in my guess of the occupants of these dens, will choose to raise offspring here in the spring. That opens up the possibility of me putting a remote camera inside the dens in addition to a camera outside the den to observe the kits as they develop.

I can hardly wait.
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Update: My new YouTube channel: @WhatLivesinmyYard talks about the porcupine in Episode 1.

Saturday, December 10, 2011

Trailcam catches a white-tailed deer- finally!

The broad, brown tail with a white tip confirms the species
as a white-tailed deer.
Photo by Brad Sylvester, copyright 2011. Do not copy.
After determining that white-tailed deer do, indeed, live in my yard based on the tracks they left in the snow and the droppings they left, I placed my trailcam in a spot that I thought was likely to be frequented by passing deer. The evidence of tracks in the snow at this location made that an easy choice, but there are other clues that this might be a good travel route for deer as well.

Glens (long, shallow valleys among the hills) are
often preferred terrain for deer trails.
Photo by Brad Sylvester, copyright 2011. Do not copy.
The daylight photo at the right shows the terrain a little better. You'll notice that it is relatively clear of underbrush, making it easy for deer to walk through. Second, a little glen runs through this particular area. A glen, of course, is a small valley-like area or a low point with higher ground on either side. Deer seem to choose glens, most likely for the natural cover they provide, as their preferred  routes of travel through the forest.

Male or Female?

At this time of the year, male white-tailed deer have antlers for the rutting season. later in the winter, their antlers will fall off, but for now (and during hunting season) antlers are the easier way to distinguish bucks from does. The lack of antlers on this deer says that it is a doe. From the size relative to the plants around it, it looks as though it is an adult female. It looks well-fed.

Determining a Deer's Sex with Hoof Prints

In the photo, you can see that as this deer is walking, it move its right front and left rear feet at the same time and vice versa. With each step the rear foot comes up near the front foot of the same side.
When tracking deer, I've been told that you can tell the sex from the hoof prints alone. I didn't know if it was true, but this picture seems to confirm what I've heard. The story goes like this: female deer walk with their rear feet outside (or wider) than their front feet because they have wider hips for giving birth. Bucks, on the other hand, have broad, muscular chests to carry the weight of and fight with their antlers. This widens the distance between their front feet making the buck's front feet wider apart than their back feet. I can't verify the accuracy of this method, but that's what I've always heard and this picture of a doe confirms that her rear feet are indeed wider than her front feet. With a number of similar photos of both sexes, we could answer this for sure, one way or the other.The rear foot will often be placed either a bit behind the front foot print, or even on top of it, partially covering it.

Trailcam Photo Quality 

The trail cam photo of white-tailed deer at the top left of this entry has been adjusted by me using a basic photo editor. I adjusted brightness and contrast until I felt the deer was easier to see. You'll notice the small branch in front of the camera that seems to have affected the focus a bit. I've removed the branch so that, hopefully, the next photo will be clearer. The original, unretouched photo is at the lower left of this entry.

Unadjusted trailcam photo taken using an infrared
flash in the dark of night.
Photo by Brad Sylvester, copyright 2011. Do not copy.
You can also see from the time stamp on the photo that it was taken at 2:58 a.m. EDT on the morning of December 10th. That was the day before a full moon and there was quite a bit of moonlight giving good visibility that night. The trailcam's date stamp feature lets you know what time deer are active at specific locations. BY tracking time patterns, you can see if a particular deer uses the trail regularly, perhaps to journey back and forth to a preferred feed spot.

I've mentioned previously that deer tend to feed in the early evening hours and early morning hours, right around dusk and dawn. Remember what animals with this pattern are called? They are called crepuscular feeders. White-tailed deer are often hunted during the daylight hours when they can be found walking around actively. Finding them active also at this late hour of the night means that deer can be found roaming the woods at practically nay hour of the day or night.


Sunday, December 4, 2011

White-tailed deer drops more clues in my yard

Pile of droppings from a white-tailed deer.
Photo by Brad Sylvester. copyright 2011. Do not copy.
In my last entry, I showed the tracks of the white-tailed deer in the shallow snow in my back yard. Read details about deer tracks and white-tailed deer information at this entry. I have had the trailcam set up for 24 hours in a position where the tracks suggest deer pass fairly regularly. Checking it this morning, it recorded no activity.

However, I did find new evidence of white-tailed deer living in my yard yesterday morning when I was setting up the trail cam. That evidence was scat or deer droppings. As I mentioned in the previous post, white-tailed deer are ruminants, meaning they have several chambers in their stomachs and chew their cud to get the maximum amount of nutrition from their food. This results in droppings or scat with a very uniform consistency, there are no identifiable bits of wood fibers or anything else in white-tailed deer scat.

Detail of white-tailed deer scat showing tapered nub at
the ends of the pellets.
Photo by Brad Sylvester. Copyright 2011. Do not copy.
White-tailed deer scat takes the form of a small pile of pellets each measuring roughly 5/8" in length. The pellets are all very similar in shape. They are little ovals with a small nub at the end as it tapers down as shown in the detail picture to the right. Rabbit pellets will be distinctly round as opposed to oval shaped. Porcupine pellets will vary in length and shape as opposed to uniform deer pellets.

Some animals leave droppings outside their dens and it eventually builds up to large accumulations of droppings. Deer are not one of these. Deer droppings will be found in small, isolated piles along the path the deer followed.

Depending upon the deer's diet, the pellets may all be stuck together in a clump, but in my experience, this is fairly rare in New England and you are much more likely to find deer droppings as individual pellets as shown in the photos on this page.

Determining the Age of Deer Scat

The exact color of the white-tailed deer's scat may vary according to diet as well. Generally black to dark brown when fresh and turning light brown to tan when old and thoroughly dried out. The dropping shown in these pictures are between 2 days and 5 days old. I can tell that they are fairly fresh from the look of them, but I walked the trail on which they were found several times a week and so was able to establish that time window for their deposit. If you slice them in half, deer droppings tend to dry out from the inside out and you can tell about how old they are by the amount of drying inside. I'm not cutting these open to demonstrate. It takes some practice, but to learn the typical drying patterns, find a fresh pile along a frequently travelled trail and cut open a pellet every day so you know the exact age of the scat and can see how much it dries each day. This may vary by the season and weather, as well. Then, when you are hunting or scouting hunting locations, you'll be able to tell the approximate age of the scat and determine how fresh the trail you're following may be.

Other aging clues are the amount of fallen leaves or other debris on top of the scat pile or snowfall.

With the tracks I had already found, I was quite confident that white-tailed deer lived in my yard. Now, the scat provides even more solid evidence of their frequent presence in my back yard, so we can definitely say that white-tailed deer live in my yard.

Sunday, November 27, 2011

Tracking White-tailed Deer in my Backyard

Even though it is old and detail has been lost due to
melting snow, we can still be sure that this track was
left by a white-tailed deer.
Photo by Brad Sylvester, copyright 2011. Do not copy.
In the summer, it can be difficult or impossible to know how many animals or what species walk through the woods in my back yard. I can set out a trail cam, listen at night, or sit quietly and wait for something to walk by, but these areimperfect methods at best. Many animals will smell me and avoid the area,  get missed by the trailcam's motion detector or pass by so silently that I never notice them. In the winter of New England, however, it is a different story.

Animal Tracks in the Snow

That different story is told by tracks in the snow. After a fresh, light snow, animals make very clear and distinct footprints that identify them as accurately as a good photograph. Of course, that only applies to fresh prints that have not had time to melt and lose their detail. Today, three days after four inches of snow fell, I went out to see what kinds of tracks I could find in the woods in my back yard. It is a warm day, and it's been warm for several days since the snow fell so it has mostly melted away. There is still about an inch or two of snow in most places in the woods, but is it slushy and wet.

Nevertheless, even with fine details metled away into oblivion, there is enough evidence to give us some idea of the animals that have passed by.

Hoof Prints in the Snow

Tracks of a white-tailed deer walking
calmly through my backyard.
Photo by Brad Sylvester, copyright 2011.
Do not copy.
Some animals tracks are very distinctive and are very difficult if not impossible to mistake even when most of the detail is gone. One such set of prints are those of the white-tailed deer (Odocileus virginianus). It is one of just two common hooved animals in the forests of New Hampshire. The other is the moose which has much larger feet. This, of course, excludes hoofprints found on the roof of a house after December 25th, which could only be magical reindeer.

Moose Prints or Deer Prints?

So when we see footprints that look like those in the photo at the beginning of this entry, with two distinct halves in each print, a twin-teardrop or arrowhead shape, and a lack of individual toes, we can be pretty certain that they are deer or moose prints. Deer footprints tend to max out at about 3" in length, while moose prints typically run 4.5-5.5" in length. The one thing of which we need to be careful, however, is that footprints in melting snow tend to get bigger over time. If the snow melts a bit, refreezes and melts a bit more, the apparent size of the prints can be quite different than they were when fresh.

How Many Deer Live in my Backyard?

In walking through my back yard, I ran across about half a dozen separate sets of deer footprints. I don't count single paths with multiple sets, because it may be the same animal walking back and forth over the same familiar path. Indeed there's no real way to know if the same animal made more than one set of prints in different areas. If the prints were fresh and distinct, I could measure them and those of different sizes could be attributed to different individuals. Because these are old, and the snow is melting, no reliable measurement can be made.

By finding places where there are multiple sets of deer prints, I can find a good location to set up my trailcam to try to get some pictures of the white-tailed deer that live in my yard.

Do These White-tailed Deer Really Live in my Backyard?

My yard is only about 5.25 acres, of which about 1 acre is cleared and the rest forested. This not even close to enough room for a deer to live all the time. a white-tailed deer will range over an area of about one square mile even if food is plentiful. If food is scarce, then it may cover much more area. So while these deer don't reside in my yard 24 hours a day. My yard is certainly within their normal territory so we can say, yes, these white-tailed deer do live in my yard at least part-time.

In other parts of the country there are other species of deer so the identification from footprints would be much less certain, but in New Hampshire, excluding escaped farm livestock, there only moose and white-tailed deer that might leave hoof prints.

Finding a Fawn All Alone

If you should find a tiny fawn lying alone in the grass, rest assured that it has not been abandoned. When danger is near, the mother will hide the babies in the grass where they will lie flat and still until the mother's return. If the mother has more than one fawn, she will have each one hide in different places.

Quick Facts about White-tailed Deer?

When do they live here? White-tailed deer live in the forests of New Hampshire all year round.

Where do they go in winter? White-tailed deer do not hibernate and are active all winter long. They may take shelter under the branches of evergreen trees or in thich brush to escape the elements durign a particularly harsh winter storm.

Diet: White-tailed deer are herbivores (vegetarians). They will graze on grass in open fields and the eat tender shoots of young ground plants and  during the summer. In the fall, they may eat nuts and fallen fruit. During the winter, when there is a deep snow cover, they  will eat the buds and ends of small softer twigs from trees (which can be a problem for home-owners with ornamenal landscape shrubs like lilacs). Deer, like cows, are ruminants which means they have a stomach with multiple chambers (four) and regurgitate their food after it is partially digested to chew it a second time. This is called chewing their cud.

How big do white-tailed deer get? A big male can reach as much as 300 pounds in weight. The largest deer taken by hunters in New Hampshire in 2010 weighed 289.5 pounds according to NH Fish & Game Department records.

How fast can white-tailed deer run? Over short distances, white-tailed deer can run about 30 miles per hour. This is roughly equal to an average full-sized dog in good physical condition, but dogs can likely keep up the pace longer than the deer chasing it until it is too exhausted to escape or put up much of a defense.

What are the main predators of white-tailed deer? Humans are the main predators of white-tailed deer. In New Hampshire in 2010, hunters killed 9759 deer. Domestic dogs are the second largest killer of wild deer in New Hampshire.

Lifecycle of White-tailed Deer: Deer mate during a rutting season in the fall and early winter. Fawns are born about 7 months later. Typically, the female will give birth to one or two fawns each season. The babies may remain with the mother for one to two years before going off on their own. They reach adulthood after about 16-18 months are are ready to have babies of their own by the fall of their second year.

Lifespan: White-tailed deer usually live about 2-3 years. Maximum lifespan would be 20 years, but, says the University of Michigan's Animal Diversity Web, "few live past 10 years old." That's largely due to hunting fatalities.

Range: With the exception of the desert Southwest, white-tailed deer can be found throughout the 48 states and through southern Canada.

Interesting Notes: With adult males weighing 200-300 pounds, the white-tailed deer is the largest animal living in my yard that we've identified to date (although there are two larger animals that may also live here, we haven't identified them since I started this blog).

When a deer is walking at normal speed, the hoofprints will tend to be shaped like an arrowhead with the points at the front coming together. When it is running, however, the points tend to splay outward so that the front tips are angled away from each other.

Male white-tailed deer grow new antlers each year and then shed them typically between January and March after mating season has ended. The antlers are used to defend territory from other males during the mating or rutting season which makes the antlers at the largest size of the year during hunting season November-December. Females do not grow antlers at all.

Saturday, November 19, 2011

Gray Squirrel (Sciurus carolinensis): Trailcam Fail

The bushy tail in the center of the bottom edge of this trialcam
photo is enough to identify this animal as a
gray squirrel.
Photo by Brad Sylvester, copyright 2011. Do not copy.
In my last post, I talked about setting up my trailcam to try to catch some photos of what I presumed would be a squirrel that had left some telltale signs at the base of a tree. I worried that the trigger time of the camera would be too slow to catch a fast-moving squirrel as it scooted up and down a tree trunk. It appears that I was correct to worry. Although the trailcam captured 20 very nice pictures of a tree trunk, it appears to have captured only one single picture of a bushy tail at the lower edge of the frame.

Fortunately, this is enough to make a positive identification of the pine seed eating visitor as a Gray Squirrel (Scuirus carolinensis), also known as the Eastern Gray Squirrel. I was also able to catch some pictures of a gray squirrel in my yard with my regular camera during the daytime so that we can compare the tail captured by the trailcam with a known gray squirrel. I can't tell whether this is the same gray squirrel in both locations, about fifty yards apart.

Although naturally skittish, gray squirrels may
become acclimated to human presence by regular
feeding. This is generally a bad idea as they often
become quite inistent and may become pests.
Photo by Brad Sylvester, copyright 2011. Do not copy.
Unlike many animals, gray squirrels don't tend to be particularly territorial over their feeding range, especially outside of breeding season. During breeding season, they'll defend their nesting locations from other squirrels fiercely with loud, aggressive vocalization and physical attacks, driving intruders away and chasing them until they are far enough away to pose no threat.

Even during this time, however, they will eat side by side near a bird feeder or other source of food without too much issue, it is only the home base that seems to instill territoriality instincts in the gray squirrel. This shouldn't be mistaken for the courtship chases as the male often chases the female through the branches of trees as well. Gray squirrels are opportunistic breeders and don't form mated pairs.

The gray squirrel gets its name from its color as you would expect. It is predominantly gray, but has some brown or reddish patches, commonly on top of its back, on its face, and on its legs or feet. Despite these reddish markings, it is quite different in appearance than the red squirrel which is predominantly reddish in color, almost fox-red, and which is much smaller than the gray squirrel.

The gray squirrel is the largest of the eastern tree squirrels and adults are typically 1-1.5 lbs in weight and about 20 inches long, half that length comprised of the tail. In New Hampshire (and many other states), gray squirrels are considered a game animal and may be hunted in season (September 1st- December 31st in New Hampshire). In this state, hunters are permitted to take as many as 5 gray squirrels each day as per information published on the NH Fish & Game website. Despite this, gray squirrels are abundant and thriving throughout New England.

Gray Squirrel looking for dropped birdseed under a feeder.
The brownish-red patch on its back is visible here.
Photo by Brad Sylvester, copyright 2011. Do not copy.
Gray squirrels have adapted well to a suburban lifestyle, raiding gardens and bird feeders at every oipportunity. Gray squirrels will tend to store their food for the lean winter months by caching or hiding it away. They are known as scatter cachers because they make many hundreds or thousands of food stores rather than storing it all in one central location. They'll bury acorns and other seeds all thoughout the spring, summer, and early fall or place them in tree cavities for retrieval when the snow is deep. When winter arrives, they'll seek out these hidden stores and eat them, but they don't find all that they've hidden making them a prolific planter of new forest trees. It's not clear whether they remember the locations as well as the Clark's Nutcracker, a scatter caching bird that is well known for its ouistanding spatial memory, or if they just go back to areas where they found food during the summer and then sniff our buried seeds.

Gray squirrels are quite fond of acorns and, as previously mentioned, pine seeds, but they will eat many varieties of seeds, nuts, and fruit as well as insects and defenseless animals such as baby birds. In New England maple seeds are plentiful and are also a part of the diet of the gray squirrel. They'll raid gardens from time to time as well.

Squirrel nest made of leaves, twigs, and pine needles
Phot by Brad Sylvester, copyright 2011. Do not copy.
Squirrels build nests out of leaves, pine needles, and twigs in the crook of the branches of a tree, generally quite high above the ground. The squirrel nest in the photo to the left was located about 40 feet up in my yard. These types of gray squirrel nests are fairly large, often measuring 18 inches or more in diameter. They are usually easily visible in the fall and winter after the leaves have fallen from deciduous trees or coniferous trees have shed some of their needle mass for the winter.

On the other hand, though, gray squirrels will also nest inside tree cavities that either occur naturally or were carved out by birds like woodpeckers. These can be much more difficult if not impossible to spot from the ground. When these kinds of nests are used, they'll alos be lined with soft materials like leaves and pine needles, presumably for comfort as well as insulation.

During rain, snow or very cold weather, squirrels will curl up in their nests for protection from the elements.

Gray squirrel babies are born in mid-summer and are blind and hairless like baby rats. They'll be cared for by their mothers in the nest that both parents helped to build until they are old enough to find or build their own places.

Quick Facts about the Gray Squirrel (Sciurus carolinensis):

Lifespan: The Adirondack Ecological Center puts the average lifespan of a gray squirrel at 1-2 years, but if they make it to adulthood, six years is more typical. The reords, says the AEC, is 12 years in the wild and 20 years in captivity.

Lifecycle: Baby Gray squirrels are born in the summer, usually in small litters of 2-3 babies after a gestation period of about 6 weeks, plus or minus a couple of days. They may stay in the nest for as little as 56 days or until the follwoing spring, depending upon when in the summer they were born. They'll be ready to start their own families in the summer following the one in which they were born.

When is it here? Gray squirrels live in New Hampshire all year round.

Where does the Gray Squirrel go in the winter? Gray squirrels are active all winter long, but will hide in their nests during periods severe weather or extreme cold. They survive on hidden foods stores buried during the bountiful summer. They'll even burrow under the snow to find buried caches of food.

Are gray squirrels dangerous? While it is theoretically possibel for a squirrel to catch and transmit rabies, this is rare to the extreme and, according to eMedTV.com, there are no recorded cases of a human catching rabies from a squirrel bite. However, they should still be treated as wild animals that will inflict a painful bite subject to infection.

Notes: Gray Squirrels belong to the order of Rodentia (Rodents) characterized by their large front incisors which have a chisel shape for efficient gnawing. Sometimes squirrels will gnaw their way into a house and set up residence inside the wood-framed walls or in the attic.