The National Bison Range is a diverse ecosystem of grasslands, Douglas fir and ponderosa pine forests, riparian areas and ponds. The National Bison Range is one of the last government owned palouse prairie native grasslands in the U.S. It supports herds of bison, elk, mule deer, white-tailed deer, pronghorn, big horn sheep, and mountain goats as well as various predators such as coyotes, mountain lions, bears and bobcat and a variety of smaller mammals. The refuge has recorded 205 bird species with more added every year.