Mammals
NPS/Mike Angermeier Yellowstone is home to the largest concentration of mammals in the lower 48 states. Sixty-seven different mammals live here, including grizzly bears and black bears. Gray wolves were restored in 1995 and more than 100 live in the park now. Wolverine and lynx, which require large expanses of undisturbed habitat, are also found in the Yellowstone ecosystem. Seven native ungulate species—elk, mule deer, bison, moose, bighorn sheep, pronghorn, and white-tailed deer live here. Non-native mountain goats have colonized northern portions of the park and numerous small mammals are found throughout the park. View all wildlife safely. You must stay at least 100 yards (91 m) away from bears and wolves and at least 25 yards (23 m) away from all other animals—including bison, elk, bighorn sheep, deer, moose, and coyotes. Visit our Wildlife Viewing page for more information. Also visit the Wildlife Chapter of the Resource and Issues handbook and the Greater Yellowstone Science Learning Center for more in-depth information and reports on mammals.
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Want to see bears?
Park bears have fascinated visitors throughout the history of Yellowstone. Read More
Did You Know?
There are more people hurt by bison than by bears each year in Yellowstone. Park regulations state that visitors must stay at least 25 yards away from bison or elk and 100 yards away from bears.