Grizzly bear Tim enjoys his tree enrichment at Brookfield Zoo Chicago. More than 900 Balsam fir trees used during Brookfield Zoo Chicago’s Holiday Magic event are repurposed every year as mulch, ...

The return of the bison means the return of the prairie, one of the three great grassland ecosystems on the planet.

A pack of wolves took down a bison in Yellowstone National Park and attracted a crowd of people — that the rest of the bison herd then charged into.

Ever thought about buying a bison? They're big, hairy (and sometimes dangerous) animals. Adult bison reach about six and a half feet in height and can weigh up to 2,800 pounds. The U.S. Department ...