Bald eagles frequent the Refuge during the winter. Golden eagles and peregrine falcons are seen soaring over the Refuge during spring and summer. The Refuge is also home to deer, elk, pronghorn antelope, and an occasional bighorn sheep especially during moderate or severe winters. Moose are found in the wet, riparian areas during the spring, summer and fall. Deer and elk are commonly seen anywhere on the Refuge during moderate to severe winters.
River otter use the Green River and Refuge wetlands year round.
At the time of Euro-American contact, Comanche, Shoshoni, and Ute tribal groups occupied the Browns Park area. Blackfeet, Sioux, Cheyenne, Arapaho, and Navaho tribes also visited or used the area. Expeditions, such as the Dominguez and Escalante expedition in 1776 and the Lewis and Clark expedition in 1805, documented use and occupation by various tribes in the Browns Park area. In 1837, Fort Davy Crockett was built on present Refuge property to protect settlers and trappers against Blackfoot Indians and to serve as a trading post. The Fort was abandoned in the 1840's as trapping declined and white residents left.