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Mexican whip-poor-will : ウィキペディア英語版 | Mexican whip-poor-will
The Mexican whip-poor-will, (''Antrostomus arizonae''), is a medium-sized (22–27 cm) nightjar from the southwestern United States and Mexico. The whip-poor-will is more often heard within its range, but less often seen. It is named onomatopoeically after its song. This bird previously was lumped with the eastern whip-poor-will, however with both types having different ranges and vocalizatons, the eggs having different coloration, and DNA sequencing showing enough differentiation, it was determined enough evidence was available to separate the 2 types into different species.〔Chesser, R. T., R. C. Banks, F. K. Barker, C. Cicero, J. L. Dunn, A. W. Kratter, I. J. Lovette, P. C. Rasmussen, J. V. Remsen, Jr, J. D. Rising , D. F. Stotz, and K. Winker. 2010. Fifty-first supplement to the American Ornithologists’ Union Check-list of North American Birds. Auk 127(3):726-744.〕 Adults have mottled plumage: the upperparts are grey, black and brown; the lower parts are grey and black. They have a very short bill and a black throat. Males have a white patch below the throat and white tips on the outer tail feathers; in the female, these parts are light brown. ==Ecology== Their habitat is woodlands of southwestern United States, and Mexico. These birds forage at night, catching insects in flight, and normally sleep during the day. Whip-poor-wills nest on the ground, in shaded locations among dead leaves, and usually lay two eggs at a time. The bird will commonly remain on the nest unless almost stepped upon.
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