File:Birds of Yellowstone and Grand Teton National Parks (197-?) (20359101866).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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TREE SWALLOW (Iridoprocne bicolor) Tree swallows have glossy green-black backs and white underparts. Be- cause of the abundance of aerial insects, on which they feed, they are generally widely distributed throughout both parks. However, they nest primarily in tree cavities of the aspen, in company with mountain blue- birds, flickers, house wrens, and dusky flycatchers. In their incessant pur- suit of insects, tree swallows glide in wide, flat circles, darting this way and that in pursuit of their insect prey. Tree swallows are the first of their kind to arrive in spring. Following pair formation, the pair selects a hole in a tree and the female lays from four to six white eggs. The violet-green swallow, which is also common in both parks, resembles the tree swallow, but displays prominent white rump patches.
Text Appearing After Image:
BARN SWALLOW (Hirundo rustica) A handsome swallow with a blue-black back, cinnamon-buff underparts, and a deeply forked tail, the barn swallow is the epitome of grace and ease of flight. The barn swallow flies close to the ground in an undulating flight pattern. While in flight this species often utters its musical, twittering song. In Yellowstone and Grand Teton the barn swallow breeds in open meadows and marshlands. In general coloration the barn swallow re- sembles the cliff swallow, but the squarish tail and buffy forehead patch and underparts readily distinguish the latter species. The nest of the barn swallow is a mud cup lined with feathers. It is most often placed under a bridge or upon the side of a cliff. 43

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