The peregrine falcon is among the fastest birds, flying at up to 55 mph and diving at more than 200 mph when striking avian prey in mid-air. Peregrine populations began to decline in the 1940s because of pesticide contamination. One of three North American subspecies, the peregrine in Greater Yellowstone (Falco peregrinus anatum) was considered extirpated by the 1970s. As part of a national reintroduction program, captive-bred peregrines were released in Yellowstone and Grand Teton national parks during the 1980s. They typically reside in Greater Yellowstone from March through October, when their favored prey—songbirds and waterfowl—are most abundant. During winter they migrate as far south as Mexico or farther. Continue: History and Recovery in Yellowstone
Number in Yellowstone
The Yellowstone Resources and Issues Handbook, updated annually, is the book our rangers use to answer many basic park questions.
Annual Bird Program Reports. National Park Service, Yellowstone National Park.
Enderson, J.H.,R.J. Oakleaf, R.R. Rogers, J.S. Sumner. 2012. Nesting performance of peregrine falcons in Colorado, Montana, and Wyoming, 2005–2009. The Wilson Journal of Ornithology 124(1):127–132
White, C.M., N.J. Clum, T.J. Cade, and W. Grainger Hunt. Peregrine Falcon. The Birds of North America Online.