Tag Archives: Brown Bears

How Can You Tell if a Kodiak Bear is a Male or a Female?

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Unlike cartoon bears, female Kodiak bears don’t wear hair ribbons on their head, so you must depend on other factors when trying to differentiate a male from a female bear. Last week, when I wrote about how to judge the size of a bear, I covered some of the ways body shape and musculature vary between males and females, but I will cover body shape and other clues in more detail this week.

Does the Bear Have Cubs?

This statement seems so obvious to me that I almost forgot to mention it. I’m sure most of you know male bears do not hang around with cubs. Regardless of what you might have seen in the movies, a Kodiak bear accompanying cubs is always their mother.

Do you see sex organs?

Minus cubs, there are only two sure ways to determine the sex of a Kodiak bear. The first is the presence of either nipples or a penis sheath and testicles. Even if you don’t see her cubs, you might see nipples in the armpit area of a nursing female when she walks. While often not visible, you sometimes see the penis sheath and testicles on a male, especially on a large boar.

Have you seen the bear urinate?

The only other way to be certain of the sex of the bear is to watch it urinate. Females urinate outward and to the rear, while males urinate straight down or forward between the legs. Females also sometimes squat to urinate.

Head and Shoulders:

If you do not see cubs or sex organs, and if the bear is not cooperative enough to urinate in front of you, you will have to depend on other clues to make an educated guess at the sex of the bear. Some of these are the same body shape differences I covered last week when I discussed how to determine the size of a bear.

A female brown bear’s head is narrower than a male’s, and her muzzle tapers, giving her a pointy nose. A female also has narrow shoulders roughly the same size as the head. Male Kodiak bears are more muscular than females. A male has a wide head and a square face. A large male’s forehead muscles bulge, creating a furrow or valley down the center of the forehead, and his massive shoulders are noticeably wider than his head.

Body Shape and Legs:

An adult female brown bear’s legs are shorter and thinner than the legs of an adult male, but unless you are comparing two bears standing side by side, it is not easy to determine the sex of the bear by looking at its legs. Males have robust front legs, and they are heavy through the ankles, ending at their wide feet. A female’s legs taper slightly, giving her the appearance of thinner ankles. Also, because females have shorter legs, their bodies hang lower to the ground.

The body, legs, and mid-section of a male brown bear look heavy and bulky, but since females aren’t exactly dainty in appearance, it is difficult and often misleading to use body shape to determine the sex of a bear. My husband, who had been around Kodiak bears all his life and has been a guide most of his life, says he is still sometimes surprised when he watches a young bear he is certain is a female until the bear urinates, and he realizes it’s a male.

Conclusion:

Unless a bear has cubs, you see her nipples or his genitalia, or you see the bear urinate, it is impossible definitively to differentiate male and female Kodiak bears. A huge bear is probably a boar, but large sows can also look huge, especially after a summer gorging on fish and berries.
The body shape of a bear provides clues to its gender. A heavy, bulky bear with a wide head and shoulders and a furrow down the middle of its forehead, is likely a male. It is more difficult, though, to distinguish sub-adult males from females.

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I hope my posts on bear size and gender answer a few questions about identifying bears in the field. The bottom line is that it’s impossible to pin down the gender of a bear from a distance, but you should be able to tell whether the bear is small or large by looking at the shape of its body.

Next week, I have a treat in store for you. My friend and fellow author, Steve Levi, has agreed to write a guest post about his books and his background. Be sure to stop by next week and meet Steve.

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Robin Barefield is the author of three Alaska wilderness mystery novels, Big Game, Murder Over Kodiak, and The Fisherman’s Daughter. To download a free copy of one of her novels, watch her webinar about how she became an author and why she writes Alaska wilderness mysteries. If you like audiobooks, check out her audiobook version of Murder Over Kodiak. Also, sign up below to subscribe to her free, monthly newsletter on true murder and mystery in Alaska.

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Kodiak Bear Management

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Wildlife management most often involves managing humans. Research allows biologists to understand the needs and habits of wildlife, and this research hopefully leads to management policies to enable human populations to better coexist with wildlife. Wildlife management is never easy, and Kodiak is no different from anywhere else. Various user groups attempt to pressure wildlife managers into making decisions to further their particular interest, and managers struggle for a balance to try to accommodate a variety of users while protecting the wildlife and the habitat.

On the Kodiak Archipelago, I am proud to say the management of bears and their habitat is not only done well, but it is done so well, it is considered one of the best models of wildlife management in the world. The Kodiak National Wildlife Refuge managers, the Alaska Department of Fish and Game, the native corporations, and the citizens of Kodiak work well together to safeguard bears and protect their habitat.

History has shown us that protecting wildlife habitat is often the most difficult aspect of wildlife management, whether there is oil to be drilled, copper to be mined, trees to be cut, or roads and houses to be built, economics often wins while wildlife loses huge chunks of critical habitat. Brown bears require large tracts of wilderness to survive, and as the human population grows, it becomes more and more difficult to protect the bears’ home from economic and residential development.

The Kodiak National Wildlife Refuge is the largest intact, pristine island ecosystem in North America. The Refuge encompasses 16 lakes, 117 salmon streams, wetlands, grasslands, shrublands, Sitka spruce forest, tundra, and alpine meadows. This habitat supports 250 species of fish, birds, and mammals, including 400 breeding pairs of bald eagles. It supports 3000 bears, and an estimated 3500 bears live on the Kodiak Archipelago.

One of the stated purposes of the Kodiak National Wildlife Refuge is to conserve fish and wildlife populations and habitats in their natural diversity, including, but not limited to, Kodiak brown bears, salmonids, sea otters, sea lions, and other marine mammals and migratory birds.

The Kodiak National Wildlife Refuge was established in 1941 in response to concerns by bear hunters for the health and survival of the Kodiak brown bear population. The original mission of the Refuge was “to protect the natural feeding and breeding range of the brown bears and other wildlife on Uganik and Kodiak Island.” Without the strong lobbying efforts of hunting groups, it is doubtful the Kodiak National Wildlife Refuge would have been formed. The sale of bear hunting licenses and bear tags on Kodiak generates over $250,000 annually, and much of this money is used for research and habitat protection.

Bear hunting on Kodiak today is very tightly regulated. Each year, 4500 people apply for the 495 available bear-hunting permits. Of these 495 hunters, approximately 175 are successful, and 75% of the bears killed are male. All hunters must check in with the Alaska Department of Fish and Game office in Kodiak before going into the field, and they must check out with Fish and Game before leaving the island. Every bear killed must be inspected by an Alaska Department of Fish and Game biologist before it can be taken off the island. Because these strict regulations have the overwhelming support of guides and residents, illegal bear hunting on Kodiak is rare.

Perhaps the most telling fact proving the Kodiak bear and its habitat are well managed is the 3500 brown bears currently living on the Kodiak Archipelago. Biologists believe this is the largest the Kodiak bear population has ever been.

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Robin Barefield is the author of three Alaska wilderness mystery novels, Big Game, Murder Over Kodiak, and The Fisherman’s Daughter. To download a free copy of one of her novels, watch her webinar about how she became an author and why she writes Alaska wilderness mysteries. Also, sign up below to subscribe to her free, monthly newsletter on true murder and mystery in Alaska.

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Kodiak Bear Cubs

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A Kodiak bear cub fetus develops for only two-and-one-half months, so the cubs are very underdeveloped when they are born. No other mammals except marsupials have such immature offspring at birth. The cubs weigh 1/400 to 1/1000 of what they will weigh as adults. If the same were true for humans, a grown man might weigh as much as 8000 lbs. Cubs are born at such a premature stage of development because the mother must provide nutrients for her unborn young while she is in hibernation and not eating. She provides these nutrients by breaking down her body protein, which causes her to lose muscle mass. If she carried the cubs longer, she would lose too much muscle mass and would not be able to move by the end of hibernation. While a shorter gestation period produces underdeveloped cubs, the mother maintains enough physical strength to be able to care for her offspring. Cubs continue to develop after they are born.

At birth, brown bear cubs are nearly helpless. They can detect temperature changes and move closer to their mother to seek warmth, and they are also able to find the sow’s nipples to nurse. They weigh about one pound (.5 kg) and are blind, deaf, and unable to smell. They are covered by a fine hair and are toothless, weak, and uncoordinated.

A brown bear sow has three pairs of nipples. She may nurse on her side in the den but normally nurses in a sitting or partially-reclined position after emerging from the den. A bear’s milk contains an average of 33% fat, as compared to human milk which contains 3.5% fat. Bear’s milk consists of 11 to 15% protein and 0.3 to 0.6% carbohydrates. Due to this diet of rich milk, brown bear cubs grow rapidly.

A cub’s eyes open about four weeks after birth, and he begins to walk at six weeks. A Kodiak bear cub’s weight doubles every two months during the first year. The cubs are completely dependent on nursing for 24 weeks and may continue to nurse for as long as 82 weeks.

On Kodiak, most cubs stay with their mothers for three years, and nearly half of all Kodiak bear cubs die before they leave their mothers. Causes of death range from starvation, accidental separation from their mother, deliberate abandonment by their mother, fights with other bears, accidents, and infanticide, most often, but not always, by large boars.

Researchers have postulated that the reason for infanticide, the killing of the young of one’s species, is so the male can eliminate the offspring of another male, bring the female into estrus, mate with her, and pass along his genes to the next generation. While this theory might prove true for some species, it doesn’t make sense for bears. For one thing, bears are seasonal breeders in the spring, but boars often kill cubs in the summer when the female cannot go into estrus again. During the mating season, a boar would have to kill all the cubs in the litter for the mother to go into estrus, and even then, the female would not become sexually receptive for several weeks. Unless he waited around for the sow to be ready to mate again, the boar who killed the cubs probably would not be the bear who eventually mates with the mother. Also, females are sometimes the perpetrators of infanticide.

A friend of mine saw a large male bear walk up to a den, stick his head in the den, pull out a cub, shake it to death, and continue on his way. It is difficult to coordinate the actions of that boar with any biological theory. We humans often feel the need to understand the purpose behind every animal behavior, yet we do many things with little or no purpose in mind.

Next week I’ll write more about bear biology and behavior. Please let me know if you have any questions or comments.

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Sign up below for my free, monthly mystery newsletter about true murder and mysteries in Alaska. If you’d like to watch a free webinar about how I became a published author and why I write wilderness mysteries, please follow this link: http://bit.ly/2pcCOo6.

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What Senses do Kodiak Bears Use Most?

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Bears, like all animals, depend on their senses to survive.  They use their senses for many things, but especially to find food and detect possible threats. A bear’s sense of smell is its most important sense.  A brown bear’s sense of smell is three to four times more sensitive than that of an average dog, and it is difficult for humans with our relatively poor sense of smell to comprehend what this means and how much a bear depends on this sense.  A bear uses his nose to find food, locate a mate, and avoid danger.  A bear downwind from you may smell your presence and run from you while you are still several hundred yards away from him.

A bear’s second most important sense is hearing.  Brown bears have relatively small ears, but they can detect noises at a great distance.  A bear can hear the click of a camera shutter over the sound of the wind, crashing waves, or a swiftly running river.

     For a long time, biologists believed bears had poor eyesight, but scientific research has shown a bear’s eyesight is similar to that of a human’s.  Bears are not nearsighted as was once believed, and they can see colors. Brown bears often stand on their hind legs to increase their sight distance and get a better look at an object.  It is not a sign of aggression when a bear stands on its hind legs; the bear is just trying to gain more sensory input.

 

The important thing to remember is a bear does not use each one of these senses independent of the others.  If a bear sees something unfamiliar in the distance, such as a person, a boat, or even another bear, he may stand on his hind legs to get a better look, raise his nose to attempt to smell the interloper, and pick up his ears to try to ascertain unfamiliar sounds.  If he still cannot determine what the object is, he may approach it for a closer look or circle downwind from the object so that he can smell it better.

Next week, I’ll write about a bear’s fur and claws.  Does a bear’s fur change with age?  Why are some Kodiak bears blonde and others a chocolate-colored?  What is the white ring some cubs have around their neck?  How do the claws change with age?

If you haven’t signed up yet for my free monthly newsletter, don’t wait.  You won’t want to miss this month’s newsletter about crime and justice during the Alaska Gold Rush written by Alaska historian and author Steven Levi.