With a dense coat, a powerful mass of muscle and a large head ideally suited for clearing away snow and locating buried grass, bison are built for frigid conditions in Yellowstone.

A common explanation for the wallowing behavior relates to relieving skin irritations, whether that is from shedding a winter coat or seeking relief from biting insects. Bison will lie down and ...

Bison also have a large shoulder hump and a shaggy fur coat that grows thick in the winter, especially around their head and neck. Buffalo has large, pronounced horns that extend from the side of ...

That same year, state and federal agencies began eliminating some Yellowstone bison that migrated out of park boundaries. Since the winter of 1991-92, Native Americans from reservations such as ...