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eastern screech owl
The eastern screech owl (''Megascops asio'') is a small owl that is relatively common in Eastern North America, from Mexico to Canada.〔〔 This species is native to most wooded environments of its distribution and, more so than any other owl in its range, has adapted well to manmade development, although it frequently avoids detection due to its strictly nocturnal habits.〔
==Description==
Adults range from in length and weigh .〔 Among the differently sized races, length can average from . The wingspan can range from . In Ohio, male owls average and females while in central Texas, they average and , respectively.〔〔 They have either rusty or dark gray intricately patterned plumage with streaking on the underparts. Mid-sized by screech-owl standards, these birds are stocky, short-tailed (tail averages from in length) and broad-winged (wing chord averages from ) as is typical of the genus. They have a large round head with prominent ear tufts, yellow eyes and a yellowish bill, which measures on average in length. The feet are relatively large and powerful compared to more southern screech owls and are typically feathered down to the toes, although the southernmost populations only have remnant bristles rather than full feathering on the legs and feet. The eastern screech-owl (and its western counterpart) are actually one of the heaviest screech-owls, the largest tropical screech-owls do not exceed them in average or maximal weight but (thanks to the eastern screech-owls' relatively short tail) they are surpassed in length by Balsas (''M. seductus''), long-tufted (''M. sanctaecatarinae''), white-throated (''M. albogularis'') and rufescent (''M. seductus''), in roughly that order.〔〔''CRC Handbook of Avian Body Masses, 2nd Edition'' by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.〕
Two color variations are referred to as "red or rufous morphs" and "gray morphs" by bird watchers and ornithologists. Rusty birds are more common in the southern parts of the range; pairings of the two color variants do occur. While the gray morph provides remarkably effective camouflage amongst the bark of hardwood trees, red morphs may find security in certain pine trees and the colorful leaves of changing deciduous trees. The highest percentage of red morph are known from Tennessee (79% of population) and Illinois (78% of population). A rarer "brown morph" is known, recorded exclusively in the south (i.e. Florida), which may be the occasional product of hybridation between the morphs. In the state of Florida, brown morphs are typically reported in the more humid portions of the state, whereas they appear to be generally absent in the northern and northwestern parts of the state. A paler gray variation (sometimes bordering on a washed-out, whitish look) also exists in western Canada and the north-central United States.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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