Bears. Yellowstone National Park is home to two types of bears: grizzly bears and black bears. Grizzly bears are very opportunistic eaters. NPS/Jim Peaco. They can run up to 45 miles per hour (72 kph). They eat nuts, berries, plant roots, and other animals—making these top predators omnivores. They scratch their backs on 'rub trees,' leaving behind hair that scientists use to learn about bears.
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