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Elf owl
The elf owl (''Micrathene whitneyi'') is a member of the owl family Strigidae, that breeds in the southwestern United States and Mexico. It is the world's lightest owl, although the long-whiskered owlet and the Tamaulipas pygmy owl are of a similarly diminutive length.〔(【引用サイトリンク】url=http://owling.com/Elf.htm )〕 The mean body weight of this species is . These tiny owls are long and have a wingspan of about .〔''Owls: A Guide to the Owls of the World'' by Claus Konig, Friedhelm Welck & Jan-Hendrik Becking. Yale University Press (1999), ISBN 978-0-300-07920-3.〕 Their primary projection extends nearly past their tail. They have fairly long legs and often appear bow-legged. They can often be heard calling to one another just after dusk or at sunset. Their call is a high-pitched whinny or chuckle. The male and female dart around trees and call back and forth.
==Reproduction==
Elf owls usually choose abandoned, north-facing woodpecker cavities in saguaro cacti,〔Hardy, P., Morisson, M. (2001) ''The Wilson Bulletin'' 113(1)pp:23-32〕 sycamores, cottonwoods, and other hardwood trees, to raise their young. The female usually lays three round white eggs. The eggs are incubated for about 3 weeks before the chicks hatch. The young owlets fledge at about 10 weeks. Usually, chicks are born in mid-June or early July. By the end of July, they are almost always fledged and ready to set out on their own.
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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