Grizzly bears are omnivores, and their diet can vary widely. They may eat seeds, berries, roots, grasses, fungi, deer, elk, fish, dead animals and insects. In the late summer and early fall, grizzlies enter hyperphagia, a period of 2-4 months when they intensify their calorie intake to put on weight for winter denning. During this time period they can gain more than three pounds a day! Because of their diet grizzly bears have long claws between 3 and 5 inches, which are used for digging, picking fruits, catching prey and this case for holding salmon for their cub. Thanks to Lindy Taylor for another great picture.