Some bears, such as the Panda bear, are almost exclusively herbivorous. The polar bear, however is exclusively a hunter. All bears, however, are classified as carnivores.
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The average size of these bears is difficult to pinpoint, because it seems to depend greatly on the food sources available. The island grizzlies of Alaska (Kodiak and Admiralty) are considered the largest land carnivores in the world, and live on a diet of fish and other rich food. The inland animals are smaller by some 30%.
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Brown bears are technically carnivores, but in practice most of their diet consists of plant matter such as sedges, grasses, bulbs, seeds, berries, and roots. They will also eat insects, fish, and small mammals. Some of these bears have even developed predatory practices on large animals, including moose, caribou, and elk.
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There is a species of bear, the sloth bear, whose diet consists almost exclusively of termites.
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http://www.bears.org