Grizzlies have longer front claws and are larger than BLACK BEARS. Large males may weigh 250-400 kg; large females, 150-200 kg. Grizzlies have a hump on the back and a dish-shaped facial profile. They range from black through brown to blond. Often the ends of hair on the flanks, back and shoulders are grizzled (eg, have white or grey flecks).
Reproduction and Development
Courtship and copulation occur mid-May through early July; embryo implantation is delayed until fall. In delayed implantation the embryo develops slowly, while floating in the uterus. Eventually, it becomes attached to the wall of the uterus and development continues normally until birth. Young are born in January and February. Newborns weigh about 0.5 kg, are very immature, and are nursed inside dens for up to 3 months. Litters average 2 young (range 1-4). Females breed about once every 3 years (range 2-5 years). Grizzlies thus have few young and HUNTING must be carefully regulated to maintain a population. In the wild most die before reaching adulthood; 15-25 years is considered old.
Author STEPHEN HERRERO
Links to Other Sites
Natural History Notebooks
View illustrated descriptions of a huge variety of Canadian animal species, prehistoric creatures, and endangered/extinct animals. A Canadian Museum of Nature website.
Canadian Biodiversity Website
A great information source for all budding biologists. Learn about biodiversity theory, natural history, and conservation issues. From McGill’s Redpath Museum.
Yellowstone To Yukon Conservation Initiative
The website for the Yellowstone To Yukon Conservation Initiative, an international organization that seeks to preserve and maintain the wildlife species and habitats in the mountainous region from Yellowstone National Park to the Yukon Territory. Features territorial maps, wildlife profiles, and descriptions of related environmental issues.
Khutzeymateen/K'tzim-a-Deen Grizzly Sanctuary Provincial Park
An information page about Canada's only grizzly bear sanctuary, currently under the joint management of the province of British Columbia and the Tsimshian Nation.
"Bear 71" offers an interactive close-up tour of Banff National Park narrated by a female grizzly bear. From the National Film Board of Canada.