Its home to north Americas most iconic wildlife, including grizzly bears, wolves, great grey owls, beavers and bison. Every year they must survive extreme weather as the thaw transforms this mountain wilderness from freezer to furnace. The park is about 3,500 square miles of wilderness with a volcanic hot spot. Mostly in Wyoming, the park spreads into parts of Montana and Idaho too. Yellowstone features dramatic canyons, alpine rivers, lush forests, hot springs and gushing geysers, including its most famous, Old Faithful. Its also home to hundreds of animal species, including bears, wolves, bison, elk and antelope.