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Black Bears

Black Bears Emerging From Hibernation Earlier and Earlier

Historically Black Bears in northern New England start emerging from their winter dens in April. However, over the past few years they have been active earlier and earlier. This year they have been spotted throughout Vermont since the beginning of March.  Males awaken before females; females with cubs are the last to emerge.

Needless to say, after living off stored fat for several months, bears are ravenous shortly after becoming active in the spring.  They seek out tender green shoots (often near wetlands), dandelions and other early-appearing flowering plants. If there are filled bird feeders available, there’s no easier source of protein and Black Bears will take advantage of this. Excellent ursine memories mean repeat ursine visits.  If you want to decrease the chances of such a visitor this spring, it’s suggested by Fish and Wildlife that bird feeders be taken down prior to the end of hibernation, or ASAP. 

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American Beech Nuts Harvested Early

Aquatic vegetation, tree flowers, grasses and leaves have made up much of a Black Bear’s diet since its emergence from hibernation in April.  Skunk Cabbage, Interrupted Fern stems, Dandelion leaves and flowers, Red Maple seeds and clover are important sources of food in May and June.  As some of these species mature, they become fibrous and less digestible as their nutrients become incorporated into cell walls as cellulose, which is not easily digestible, so bears seek new sources of nutrition as the summer progresses.

As a general rule, berries and Jewelweed help provide mid-summer meals until nuts, a favored food, ripen and become available in the fall. Beechnuts, specifically, are a very important source of food in autumn for Black Bears bulking up prior to hibernation, as they have about twice as much protein and calories per edible portion compared to acorns. 

There are exceptions to this dietary schedule, however. This photograph, taken recently in New Hampshire, shows that there are some bears that don’t wait until days shorten drastically and temperatures drop before harvesting the fruit of American Beech. (Note that there are both fresh and previous years’ claw marks on this American Beech tree photographed by Alfred Balch.)

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Web Cam & Denning Black Bears

Someone has set up a web cam in Pennsylvania under a house where a black bear and at least one cub are denning.  Lots of sleeping, but at least one intermittently active cub whose antics you might enjoy!

https://hdontap.com/index.php/video/stream/pennsylvania-bear-den-live-cam?fbclid=IwAR3G2bVqpLpeuPLJcOKvkX7BetxSCLjAve8m7yhEtRKju1utomRTEN9yUm0

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Black Bears Still Active

Black Bears often enter into hibernation in November, but their exact timing depends in large part on the weather as well as the availability of food such as hard mast (acorns, beechnuts, etc.).  Cold temperatures and scarce food hastens their entry, and warm weather and ample food delays it.

As long as bears are active (and they still are in the Northeast due in part to relatively warm weather), one would be wise to delay feeding birds. Even though a Black Bear’s metabolic rate during hibernation can drop to a quarter of its (nonhibernating) basal metabolic rate, it still needs to put on a considerable amount of fat (some bears double their weight) in order to sustain itself while it fasts through the winter.

A pre-hibernation feeding frenzy by Black Bears is why putting up bird feeders prematurely (before Black Bears hibernate) is discouraged by most northern Fish & Wildlife Departments.  If a bear comes upon a filled bird feeder it is very likely to return to it repeatedly until it goes into hibernation. A Black Bear’s memory is very impressive and most are unable to resist a free lunch.  If you can’t put off feeding the birds for another few weeks, it’s a good idea to bring feeders inside at night if you live in bear country. 

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Black Bears Experiencing Hyperphagia

At the risk of boring NC readers who have been subscribers for six or more years, I am reposting both a photograph and narrative from a 2016 post that remains one of the most memorable animal signs I have ever come upon.

Black Bears are omnivores as well as opportunists.  They will eat almost anything that they can find, but the majority of their diet consists of grasses, roots, berries, nuts and insects (particularly the larvae).  As the days cool, and the time for hibernation approaches, Black Bears enter a stage called “hyperphagia,” which literally means “excessive eating.”  They forage practically non-stop — up to 20 hours a day, building up fat reserves for hibernation, increasing their body weight up to 100% in some extreme cases.  Their daily food intake goes from 8,000 to 15-20,000 calories. Occasionally their eyes are bigger than their stomachs, and all that they’ve eaten comes back up.  Pictured is the aftermath of a Black Bear’s orgy in a cornfield.

If you share a Black Bear’s territory, be forewarned that they have excellent memories, especially for food sources.  Be sure not to leave food scraps or pet food outside and either delay feeding birds until bears are hibernating (late December would be safe most years) or take your feeders in at night.

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White-tailed Deer Fawn Survival

Both behaviorally and physically, White-tailed Deer fawns have adaptations that enhance their survival – they remain lying down and motionless for their first few weeks while their mother is off foraging and stir only when she returns periodically to nurse them. They are scentless for their first few days, and dappled coats enable them to be well camouflaged.  Reduced heart rate and breathing when danger is nearby also increase their ability not to be noticed. 

Even so, fawns have a low life expectancy.  Once detected by a predator, they are very vulnerable. Black Bears and Coyotes, especially, are quick to take advantage of this easy meal. Proof of this can be found in the scat of these predators. (Inset photo: Black Bear scat containing the hair and bones of a fawn).

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Black Bear Cubs Sampling Solid Food But Continue to Nurse For The Next Year

Black Bears only mate every two years, due to the fact that their cubs are not weaned until they are a year and a half old.  When born in January, a cub weighs less than a pound and is roughly 9” long.  For the next three months it nurses steadily on its mother’s very rich milk (20-25% fat compared to a human’s 3-5%).  Depending on the number of siblings a cub has as well as the amount of milk its mother produces, it weighs between four and six pounds when it emerges from its den in April. 

Soon thereafter the cub starts sampling the food that its mother eats, but swallows very little. Slowly it begins to eat and digest solid food (cubs are partial to ant brood when very young), but it will still be nursing for the next year, right up until next April or May, when it is weaned by its mother who will then turn her attention to finding a mate. 

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Black Bears Waking Up & Ejecting Fecal Plugs

Black Bears spend their entire hibernation with what is referred to as a “fecal plug” in the last foot or so of their intestines. Scientists used to theorize that bears ate lots of roughage and indigestible plant material in order to form this plug that essentially prevents them from evacuating all winter. This theory has been proven wrong, as investigation has shown that the fecal plug consists mainly of intestinal secretions and cells that have sloughed off the inside of the digestive tract. After stopping eating in late fall, bears do produce a small amount of feces, which are in the plug along with hair and leafy bedding, both accumulated from increased grooming (licking of fur and then swallowing) that takes place before entering hibernation. During winter bears shed the calloused soles, or footpads, of their feet and it’s not uncommon to find pieces of them in a plug, as well.

Most fecal plugs measure 1 ½” to 2 ½” in diameter and 7”-15″ long. Fluids have been absorbed from the plug by the intestinal walls, leaving it relatively dry and hard. Its light scent is reminiscent of fermentation. Should you be fortunate enough to find a plug, it’s likely you’re quite close to its owner’s overwintering den, as bears eject their plug soon after emerging from hibernation. (Many thanks to Metta McGarvey and Stephen Brown for sharing their 9″ x 2″ fecal plug with me.)

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Black Bears Giving Birth

It’s hard to imagine at this time of year, but sometime between the last half of January (the full moon in January is often called the ‘bear moon’) and the first part of February Black Bears give birth to between one and five (usually two) tiny, blind, almost hairless, 9-inch long, one-half pound cubs, each about the size of a chipmunk. The cubs are totally dependent on their mother for food and warmth.

Most dens are exposed to the cold air, as they are located under fallen logs and brush, or are dug into a bank. Occasionally they are on the ground with little or no cover; in all of these locations, the mother acts like a furnace, enveloping her young and breathing on them to keep them warm. The cubs do not hibernate, but nap frequently. Like human mothers, Black Bear mothers sleep when their young sleep, and are alert when their cubs cry and let them know that they are in need of attention. (Photo: taken in March of two-month old Black Bear cubs)

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Acorns A Wildlife Magnet

Acorns are loaded with fats and carbohydrates, making them a perfect way for wildlife to put on pounds that will carry them over the winter.  They are also easy to open and to digest, making them significant food items for more than 96 species of birds and mammals. Among the highest consumers are White-tailed Deer (acorns are 50% or more of fall and winter diet), Wild Turkeys (up to 38% of diet in winter and spring) and Black Bears.

The impact these nuts have on the species that depend on them as a significant portion of their diet is great: Squirrels, mice and jays store them in the fall and this supply is critical to their winter survival. The geographic distribution of many animals coincides with or depends on the range of oaks, and biologists have linked acorn crop failures to poor Black Bear reproduction and meager antler growth on White-tail bucks.

(Photo – Signs of two acorn hunters. Prior to hibernation, a Black Bear (tracks down center of image) has been looking for leftover acorns in a patch of forest floor that has been scratched up by White-tailed Deer feeding on acorns.) 

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Mink’s Cubs

One last update, as so many readers have inquired about the welfare of Mink’s three cubs.  They have been sighted several times, traveling apart from one another.  One cub has been spotted more than once, but not captured, at someone’s bird feeder.  Efforts (game cameras and bait food) are being made to lure and capture them after which they will be brought to the Kilham Bear Center in Lyme, NH where they will be fed and cared for and eventually released into the wild.

Mink’s cubs are about 8 months old and weigh between 25 and 35 pounds. Black Bear cubs typically stay with their mother until they are 18 months old, at which time they are weaned and on their own.  Cubs as young as five months old have survived the loss of their mother, so one can only hope that, if not caught and raised by humans, Mink’s cubs will be as fortunate.

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A Tribute To A Grande Dame

This week I learned of the death of an old acquaintance.  Mink, a Black Bear whom I’ve photographed numerous times with numerous batches of cubs, was found dead on the banks of a river in New Hampshire, close to where she had lived for many years.  If you’ve read my children’s book, Yodel the Yearling, you’ve met one of her offspring.

Mink was an extraordinary mother — sending her cubs up a giant White Pine tree whenever danger threatened, tolerating with unbelievable patience being climbed on and bitten by her cubs, grooming burs out of the coats of rambunctious offspring with her teeth and much, much more.   She was so acclimated to people (having raised many cubs within sight of houses) she allowed me to witness her nursing her cubs multiple times (see NC post, 4/4/18).

Four years ago I stumbled upon Mink and her three yearling cubs sleeping at the base of a “baby sitter” tree.  Since then they have had a life of turmoil, having been transported to the wilds of northern New Hampshire due to becoming “pests” where they lived because people left their garbage and bird feeders accessible during times of the year when bears are active. Mink managed to find her way back to her home territory and was raising the three young cubs she bore last winter when she met her untimely death, most likely as a result of being hit by a car.  I couldn’t let her passing go by without a nod to her and the richness she added to so many peoples’ lives.  I, for one, shall forever be indebted to her for tolerating my presence and allowing me to observe and photograph ursine behavior in the wild so few are privileged to see.  (Photo:  Mink & one of her three cubs, taken 4/24/20, soon after emerging from winter natal den)


Why You Don’t Feed Birds In The Summer (if you live in bear country)

Unfortunately, habituated bears often have very short lives.  They lose their fear of humans, become “nuisance bears” and often end up being killed.  Do not worry about the birds that have been visiting your feeder all winter.  Your bringing your feeder in will not negatively affect them, as they get the majority of their food from natural sources.  Also, when birds are nesting many feed their young insects and aren’t frequent visitors to feeders. Feeding enables humans to get a close view of their winged neighbors, but it is not necessary for the birds’ welfare.

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An Ingenious Recycler

Recycling is the process of converting waste materials into new materials and objects.  In the natural world, agents such as fungi and bacteria that turn dead plant and animal matter into air, water and nutrients come to mind.  If you broaden the definition of recycling to include the re-use of material, however, many more organisms come into play.

Some humans continue to feed birds in the spring after Black Bears have emerged from their dens.  The bears have not eaten for four or five months and once their digestive system adjusts, they are extremely hungry.  Available bird feeders are often raided by hungry bears at this time of year, and end up discarded on the forest floor with the seeds they contained ending up inside the bears’ stomachs.  Eventually the bears defecate and their feces contain little else but the husks of sunflower seeds interspersed with intact seeds.  Keen-eyed Black-capped Chickadees are very quick to take advantage of these recycled sources of protein.  (Check the Chickadee’s beak closely.)

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Black Bears Emerging From Dens & Ejecting Fecal Plugs

This may look like Black Bear scat to many viewers and it is close to being just that, but technically it is a fecal plug.  A plug differs from scat in several ways.  Rather than passing through and out of the digestive system, it remains in the lower 7-15” of a bear’s intestine for four or five months, while the bear hibernates.  Unlike feces, which consist mostly of waste from digested food, a fecal plug, due to the length of time it spends in the intestine, contains a considerable amount of intestinal secretions and cells that have sloughed off the inside of the digestive tract.

Usually you find hair and bedding as well as recently-eaten indigestible food incorporated into a plug.  Prior to hibernation, Black Bears engage in grooming — licking and swallowing their fur and the leaves, etc. that are caught in it.  These indigestible materials end up in the plug.  During winter bears shed the calloused soles, or footpads, of their feet and it’s not uncommon to find pieces of them in a plug, as well.

Most plugs measure 1 ½” to 2 ½” in diameter and  7-15″ long. Fluids have been absorbed from the plug by the intestinal walls, leaving it quite dry and hard, and it has very little scent. If you happen to know where a bear has denned, the surroundings are a prime location for finding a plug, as the bear ejects it soon after emerging from its den in April. (Thanks to Andy Rowles and Erin Donahue for photo op.)

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Black Bears Active

Bears are emerging from hibernation a bit earlier than usual this year in Russia, Finland and the U.S. due to warmer temperatures.  The emergence of Black Bears from hibernation in the Northeast usually takes place next month, but they have already been active for several weeks, even in northern New England.

There is little food available to bears in April, but in March the situation is even more dire.  Therefore, bird feeders and human garbage are like bear magnets, so bring in your feeders and make your garbage inaccessible! The climate crisis is having a detrimental effect on wildlife — hibernation, migration and breeding cycles are intimately connected to the availability of food — and as a result of this out-of-sync timing, there will inevitably be more conflict between bears and humans.  (Photo: Black Bear scat filled with sunflower seeds from a bird feeder.  Thanks to Clyde Jenne and Bruce Locke for photo op.)

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Black Bears Scent Marking In Winter

Congratulations to Rinky for being the first person to correctly identify that a Black Bear had been rubbing its back side against a utility pole in Monday’s Mystery Photo!  A vast majority of responses were correct! Because of the relatively warm fall we’ve had and the ample food supply, Black Bears are still active in much of northern New England.  There is a limited amount of time when bears are awake and snow is on the ground, allowing you to see what they’ve been up to.  This year they are still feeding fast and furiously and, as the tracks in the snow confirm, scent marking.

Black Bears of all ages and both sexes engage in scent marking – rubbing their scent on trees and telephone poles (as well as biting and scratching them) that are often located along travel corridors.  Scent marking typically occurs during the breeding season in June, when males, especially, announce their presence by standing with their back to a tree or pole (often one that leans) and rub their shoulders, neck and back against it, leaving their scent.

The tracks in Monday’s Mystery Photo were discovered recently at the base of a utility pole in New Hampshire.  One look at the tracks’ position, pointing away from the pole, tells you that the bear that made them was facing away from the pole and rubbing his back side against it – proof that scent marking is not limited to the breeding season. (Photo: Black Bear scent marking the same pole in mating season, taken by Alfred Balch)

(If you are feeding birds, it would be wise to bring your feeders in at night until we’ve had enough cold weather to drive Black Bears into hibernation.)

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Yellowjacket Nests Being Raided

Because yellowjackets do not produce or store honey one might wonder why striped skunks, raccoons and black bears frequently dig up their underground nests.  It is the young yellowjackets (larvae), not honey, that is so highly prized by these insect-eating predators.  At this time of year it is crucial for them, especially black bears who go for months without eating or drinking during hibernation, to consume enough protein to survive the winter.

Whereas adult yellowjackets consume sugary sources of food such as fruit and nectar, larvae feed on insects, meat and fish masticated by the adult workers that feed them. This makes the larvae a highly desirable, protein-rich source of food. (Yellowjacket larvae reciprocate the favor of being fed by secreting a sugary material that the adults eat.)

Three to five thousand adult yellowjackets can inhabit a nest, along with ten to fifteen thousand larvae. Predators take advantage of this by raiding the nests before frost kills both the adults (except for fertilized young queens) and larvae in the fall.  Yellowjackets are most active during the day and return to their underground nest at night.  Thus, animals that raid them at night, such as raccoons, striped skunks and black bears, are usually very successful in obtaining a large meal.  Occasionally, as in this photo, the yellowjackets manage to drive off predators with their stings, leaving their nest intact, but more often than not the nest is destroyed and the inhabitants eaten.  (Thanks to Jody Crosby for photo op of yellowjacket nest (circled in red) dug up by a black bear – note size of rock unearthed.)

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Red Elderberry Attracts Wildlife Year Round

The pollinated and fertilized white flowers of Red Elderberry (Sambucus racemosa) have recently developed into the red fruit for which this plant is named. Many people are familiar with its relative, Common Elderberry (S. canadensis), which produces dark purple fruit that is used to make jams, jellies, pies and elderberry wine.  While Red Elderberry fruit can be used to make all of these, its raw berries are toxic.  Red Elderberry’s popularity is greatest with pollinators, birds and four-footed mammals.

The cyanide-producing toxins in its flowers, (raw) fruit, stems, bark, leaves and roots do not seem to discourage wildlife’s attraction to Red Elderberry.  The odor of its flowers, its nectar, and its highly nutritious pollen attract many ants, bees, wasps and flies.  At least 50 species of songbirds eat the bright red fruits, including red-eyed vireos, ruffed grouse, song sparrows, gray catbirds, brown thrashers, and thrushes. Squirrels, mice, raccoons, and black bears also eat the fruit. Porcupines, mice and snowshoe hares eat the buds and bark in winter. The foliage is usually avoided by herbivores, although white-tailed deer and moose browse on it occasionally.

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Boys, Bears & Birthdays

5-24-19 Otis in bear den2 _U1A8010Happy 4th Birthday, Otis! How brave of you to squat inside a bear’s den which was occupied by a hibernating bear until shortly before you visited it. Four or five months without eating, drinking, peeing or pooping. Think you could do that?

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Time To Take Down Bird Feeders !

3-25-19 black bears 1214Black Bears have just started to emerge from hibernation in northern New England, and their appetite is fierce. Male black bears will typically drop between 15 and 30 percent of their body weight, while reproductive sows can lose up to 40 percent of their weight over the winter. Although omnivores, a black bear’s diet consists of 85 percent plant material, especially in the spring and summer. At this time of year bears favor the tender emerging shoots of sedge and grasses, willow catkins, leaf buds and skunk cabbage. However, these plants are not always available to them when they first become active. Being opportunists, if bears can’t find natural food sources, they go looking for alternatives, such as those provided by humans.

Sunflower seeds are a Black Bear’s dream come true, nutritionally speaking. A bird feeder full of them replaces hours of foraging in the wild. With an outstanding sense of smell (many times greater than a bloodhound’s), Black Bears will find and raid feeders at this time of year when there is a lack of other food sources. Therefore, if you wish to avoid creating a “nuisance” bear, it is advisable to take down your feeders by April 1st. Black Bears have excellent memories, particularly regarding food sources. They will return time after time, and may resort to unwanted (by humans) behavior in order to get more of the food that was at one time available. Once this occurs, their well-being is jeopardized.

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Fermenting Apples & Black Bears ≠ Inebriation

11-5-18 bear scat MH_20091011_233455_4If you investigate the contents of Black Bear scat this time of year, you may well find nothing but chunks of digested and semi-digested apple (pictured).  For several weeks before hibernation begins bears spend their days and nights foraging for food that will sustain them through the coming months (“hyperphagia”).  Fermenting apples lying on the ground are accessible and very popular with bears; hence, many scats contain them.

There have been anecdotal reports over the years of Black Bears stumbling around as if inebriated, and it is often assumed that this behavior is the result of their having consumed fermenting fruit, such as apples.  Waxwings, robins and other species of birds are known to get drunk (and even die) from fermented crab apples, mountain ash and blackberries, but it’s highly unlikely that bears follow suit.

For one thing, the pH of a bear’s stomach is around 3.5 – slightly more acidic than yeast can tolerate. In addition, the time it takes for a Black Bear to digest food is typically far less time than yeast would need to convert sugar into alcohol. Lastly, size would play a large role in an animal’s ability to become intoxicated. It would take hundreds of apples consumed at their peak level of fermentation to make even a small, young Black Bear even slightly tipsy.

If you see a Black Bear stumbling and acting strange it may well be because it is sleepy or perhaps sick, but probably not drunk. However, until researchers test the blood alcohol level of a bear that’s exhibited this behavior, no–one can say for sure what caused it.

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Black Bears Scent Marking

4-20-18 black bear biteIn the Northeast, Black Bears typically emerge from their dens in April and mate sometime between mid-May and late June. Prior to mating, Black Bears of all ages and both sexes announce their presence to other bears by rubbing their scent on marking trees (maintaining several on their territory). These “trees” often include utility poles, such as the one pictured. While most of the marking is done by mature males during the mating season, this week’s storm provided proof that scent marking actually resumes in April soon after bears come out of hibernation.

Scent marking can include a bear’s rubbing its shoulders and neck against the tree/pole as well as clawing and biting the tree. Claw marks are usually quite shallow, but incisor bites are deep enough that pieces of bark and wood are sometimes pulled out.  This photograph shows where a Black Bear stood on its hind feet and with its head sideways, grabbed the pole with its mouth open and closed its jaws, scraping a horizontal groove across the pole as its upper and lower canine teeth came together.  The height of the bite was about six feet.

Fresh bear signs indicate that it’s time to bring bird feeders in (either permanently or, at the very least, at night), in order to avoid creating “nuisance” bears,  thereby putting the bears’ lives at risk.

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A Rare Privilege

4-6-18 four black bears 636-RecoveredThe hours I spent with this ursine family were some of the most special hours of my life.  It’s possible, and probably likely, that because they lived relatively close to human habitation, they were cognizant of the fact that I meant them no harm.  Regardless, they allowed me to observe their natural behavior, and that is a priceless gift to anyone, particularly a naturalist.

Black Bears are not  the monsters Goldilocks would have you believe. Offensive attacks are very rare — aggressive displays are much more an expression of their fear than anything else.  Chattering of jaws, false charges and the like are just that — bravado. Even when it comes to defending their young, they are very reluctant to be aggressive — that is much more likely with Grizzly Bears, which are not found in the Northeast. If not encouraged to become a nuisance by the presence and easy access of human lures such as garbage and bird seed, Black Bears can coexist with humans with little to no conflict.

If you’ve enjoyed the photographs of this family of bears, you (or your very young friends) might enjoy my recently-released children’s book, Yodel the Yearling, in which many of these photos plus others appear .

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