• Steam rises off of the colorful Mammoth Hot Springs Terraces


    National Park ID,MT,WY

Grizzly Bears


The Greater Yellowstone Ecosystem and northwest Montana are the only areas south of Canada that still have large grizzly bear (Ursus arctos horribilis) populations. Grizzly bears were federally listed in the lower 48 states as a threatened species in 1975 due to unsustainable levels of human-caused mortality, habitat loss, and significant habitat alteration. Grizzly bears may range over hundreds of square miles, and the potential for conflicts with human activities, especially when human food is present, will make the presence of a viable grizzly population a continuing challenge for its human neighbors in the Greater Yellowstone Ecosystem. Learn More: Grizzly Bear Information Continued…


Quick Facts about Grizzly Bears in Yellowstone

  • Approximately 150 with home ranges wholly or partially in park. As of 2011, 593 in Greater Yellowstone
  • Males weigh 200–700 pounds, females weigh 200–400 pounds; adults stand about 3.5 feet at the shoulder
  • May live 15–30 years
  • Grizzly bears are generally 1 to 2 times larger than black bears
  • Agile; can run up to 45 mph
  • Can climb trees but curved claws and weight make this difficult. Can also swim and run up and downhill
  • Considered true hibernators

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