. Birds of Yellowstone and Grand Teton National Parks . Birds; Birds. MOUNTAIN BLUEBIRD (Sialia currucoides) The male mountain bluebird is a striking bird with sky-blue or azure plum- age and light underparts. The female is a dull brownish-gray with a touch of blue on the rump, tail and wings. The Pima Indians believed that the mountain bluebird was originally an unlovely gray, but that it acquired its present exquisite azure coat by bathing in a certain lake of blue water that had neither inlet nor outlet. The distribution and abundance of blue- birds in Yellowstone and Grand Teton is apparen
. Birds of Yellowstone and Grand Teton National Parks . Birds; Birds. MOUNTAIN BLUEBIRD (Sialia currucoides) The male mountain bluebird is a striking bird with sky-blue or azure plum- age and light underparts. The female is a dull brownish-gray with a touch of blue on the rump, tail and wings. The Pima Indians believed that the mountain bluebird was originally an unlovely gray, but that it acquired its present exquisite azure coat by bathing in a certain lake of blue water that had neither inlet nor outlet. The distribution and abundance of blue- birds in Yellowstone and Grand Teton is apparently influenced to some degree by the availability of nesting sites which are largely confined to dead trees in forest clearings. Lightning fires, epidemics of wood-boring insects, and similar natural agents, including the drowning or scalding of trees by hydrothermal features, are therefore beneficial to the species. The mountain bluebird is generally common in both Yellowstone and Grand Townsend's Solitaire Dale & Marian Zimmerman WARBLING VIREO (Vireo gilvus) The warbling vireo is a plain, sluggish dweller of the forest canopy. Show- ing a decided preference for decidous trees, the warbling vireo is more easily detected by song than by sight. The song is a repetitious, rolling warble. The male sings incessantly throughout the summer. The warbling vireo may be distinguished from other small residents of the forest canopy by the heavy bill and the lack of wing bars. Vireos feed almost exclusively on insects. They are especially fond of small caterpillars and measuring worms. The nest of the warbling vireo is a neat, compact cup composed of bark fibers, fine grasses, and plant stalks, ornamented with spider egg cases, lichens, and cottonwood down. The nest is usually attached to the fork of two branches, high in a deciduous tree. The tree most commonly used for nesting in Yellowstone and Grand Teton is the narrow-leaf cot- tonwood. 50. Please note that these images a
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