Although usually thought of as a meat eating animal, grizzlies are omnivorous, that is, they will eat almost anything - fruits, roots, berries, nuts, honey and fish. Like all bears, they eat heavily during the summer, storing fat for their long winter sleep. There is currently disagreement among biologists as to whether or not bears truly hibernate. Those who argue against hibernation point out that the bears body temperature remains high and they will occasionally awaken on warmer winter days and leave their dens for short outings. This gives them a clumsy appearance.
Grizzly bears are solitary and tend to be bad tempered.
With their powerful bodies, sharp claws and ill temper, bears should always be considered dangerous to humans. They are easily able to kill or seriously injure an adult man with a single paw swipe.