File:Birds of Yellowstone and Grand Teton National Parks (197-?) (20359072606).jpg

Title: Birds of Yellowstone and Grand Teton National Parks
Identifier: birdsofyellowsto00foll (find matches)
Year: (197-?) ((190s)
Authors: Follett, Dick; Yellowstone Library and Museum Association; United States. National Park Service
Subjects: Birds; Birds
Publisher: (Yellowstone National Park) : Yellowstone Library and Museum Association, in cooperation with National Park Service, U. S. Dept. of Interior
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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PRAIRIE FALCON (Falco mexicanus) Anyone who has observed the aerial dive of the falcon, whether as part of a mating ritual or in pursuit of prey, has witnessed one of the most thril- ling and spectacular sights in the natural world. The stoop or dive of the prairie falcon may exceed 125 miles per hour. Because these magnificent birds stand at the top of the food chain and because of their popularity among falconers, both the prairie falcon and its rare counterpart, the peregrine falcon, have declined in numbers in recent decades. Stream- lined, missile-shaped birds with pointed wings, prairie falcons prey pri- marily on smaller birds and rodents. The prairie falcon is a pale brown or sandy-colored falcon. Its most distinguishing field marks are its "dirty armpits" (distinctly dark areas in the bird's wingpits). Prairie falcons are wide ranging but show a marked preference for cliff facings. They are rare breeding inhabitants of the open cliffs and canyons of both Yellowstone and Grand Teton.
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American Kestrel Leonard Lee Rue 111 BLUE GROUSE (Dendragapus obscurus) The blue grouse's scientific name translates "obscure tree lover." This phrase describes well the appearance and habits of this species, for its coloration provides excellent camouflage, and it is intimately associated with conifers, particularly the Douglas-fir. The blue grouse breeds in mixed woods or open conifers, but spends the entire winter in the conifers. Conifers provide the grouse with both food and protective cover. During the mating season the male grouse or cock attracts the female with a series of booming or hooting sounds which are produced by the inflation of yellow throat sacs. The nest of the blue grouse is built on the ground, often at the base of a tree or under a fallen log. The chicks, which hatch in 26 days, develop rapidly and are able to fly efficiently in about two weeks. Blue grouse are common permanent residents of the lodgepole pine/spruce-fir and Douglas-fir/aspen complexes in both parks. 28

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