Bears can be predominantly carnivores but are successful omnivores and are almost entirely herbivores in some areas. Biologists have identified four main food items in the Yellowstone grizzly bear population's diet that represent the highest concentrated sources of energy available.These food items include whitebark pine (Pinus albicaulis) seeds, army cutworm moths (Euxoa auxiliaries), large ungulates, and spawning cutthroat trout (Oncorhynchus clarkii)...
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As opportunists, bears will travel wherever necessary to find food, increasing the chances of human-bear interaction if food shortages in their home ranges force them to move elsewhere. This is particularly true for bear populations relying on declining species such as cutthroat trout, or whitebark pine, which currently suffers from global climate change and a disease epidemic...
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