Their life span varies from 15 to 30 years. Although both black bears and grizzlies have a fearsome reputation for scratching or mauling people to death, attacks rarely occur, and … Jesse Lee O’Connor李杰西's answer to How many grizzly bears inhabit Yellowstone National Park? .054 per year. American black bears (Ursus americanus) are excellent tree climbers.American black bears found in Yosemite National Park have long been of intense interest to park visitors and managers. Seeing one of the approximately 300 to 500 black bears in Yosemite can evoke excitement, awe, and fear. The beautiful Yellowstone landscape is also wild country - one of the last and largest undeveloped regions in the continental United States. Males usually weigh around 100-140 kg, while females weigh up to 90 kg. Yellowstone Park lies at the heart of this wild land and is home to many black bears and grizzly bears that roam through the country side they claim for their own. When it comes to how Yellowstone National Park handles bear management, a lot has changed since visitors first began pouring in more than a century ago. At that time, bears were known to feed on garbage behind park hotels, and tourists eagerly fed them along park roadways—resulting in an average of 48 bear-inflicted human injuries each year from 1931 to 1969. For many people black bears are the symbol of Yellowstone Park. Jesse Lee O’Connor李杰西's answer to How many people are killed by bears in Yellowstone a year? The unique thing about the Yellowstone is the fact that it is one of a few places where they coexist with grizzly bears. How many people get killed by bears in Yellowstone? Black bears can be found as far south as central Mexico and as far north as northern Alaska and most of Canada. Black bears are the most common bear species in North America. There have been only 8 fatalities from bear attacks in the park in its entire history, since park establishment in 1872. The American black bear is the most commonly seen bear in North America, and it has the largest geographic range. LANDER - No one, not federal biologists or conservation activists, knows how many grizzly bears there are in the greater Yellowstone ecosystem.