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Now That’s a Grizzly Bear

Grizzly Bear (Ursus arctos)

This is a very healthy female with a full coat at the end of summer. When we saw her she had triplets that were a year and a half old.

The Grizzly Bear’s prominent shoulder hump and their long claws are useful in digging for roots or excavating burrows of small mammals. The musculature and bone structure of the hump are adaptations for digging and for attaining bursts of speed necessary for capture of large mammals for food.

Bear weights vary depending on the time of year. Bears weigh the least in the spring or early summer. They gain weight rapidly during late summer and fall and are waddling fat just prior to denning. At this time most mature males weigh between 500 and 900 pounds (180-410 kg) with extremely large individuals weighing as much as 1,400 pounds (640 kg). Females weigh half to three-quarters as much.

An extremely large Grizzly Bear may have a skull 18 inches long (46 cm) and 12 inches wide (30 cm). Such a bear, when standing on its hind feet, is about 9 feet (2.7 m) tall.

Grizzly Bears have been known to live 34 years in the wild, though this is rare. Usually, old males may reach 22 years. Old females may live to 26. Grizzly Bears have an especially good sense of smell and under the right conditions may be able to detect odors more than a mile distant. Their hearing and eyesight are probably equivalent to that of humans. When bears stand upright, it is not to get ready to charge but to test the wind and to see better.

Mating takes place from May through July with the peak of activity in early June. The hairless young, weighing less than a pound, are born the following January or February in a winter den. Litter size ranges from one to four cubs, but two is most common. Offspring typically separate from their mothers as 2-year olds in May or June. Following separation, the mother can breed again and produce a new litter of cubs the following year.

In the winter when food is unavailable or scarce, most Grizzly Bears enter dens and hibernate through the winter. While in this state, their body temperatures, heart rate, and other metabolic rates are reduced. Their need for food and water is eliminated. Pregnant females are usually the first to enter dens in the fall. These females, with their newborn cubs, are the last to exit dens. Adult males, on the other hand, appear to enter dens later and emerge earlier than most other bears.

© 1996 Victoria McCormick

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About Victoria

For the last forty-five years Victoria has photographed in the Hawaiian Island Chain recording special moments in time. She hopes her images will help raise awareness of the need to preserve the integrity of Hawaii’s natural treasures. May our respect and courtesy be given to the land and its wildlife and to the ocean and its sea life.