If the food supply has not
If the food supply has not been adequate, a bear may not hibernate.
At about five or six years old, female Kodiaks begin breeding. Bears are serially monogamous, and boars will sometimes fight over a mate, sometimes causing serious injuries. Mating season peaks in June, although embryo implantation will not occur until the impregnated sow is denned in November. Only if she has gained the necessary weight for hibernation will the embryo implant and the eight week gestation begin.
In response to the winter food shortage, bears hibernate through the winter months. During this time they will not eat, urinate, or defecate. Astonishingly, they lose very little bone mass or muscle tone. But hibernating bears are not unconscious. Although their body temperatures drop close to the surrounding temperature, bears? metabolic rates remain high. They curl up to conserve heat, and may change their positions in their dens. Aroused, bears may even attack, although this is very rare.
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