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Red-shouldered hawk
The red-shouldered hawk (''Buteo lineatus'') is a medium-sized hawk. Its breeding range spans eastern North America and along the coast of California and northern to northeastern-central Mexico. Red-shouldered hawks are permanent residents throughout most of their range, though northern birds do migrate, mostly to central Mexico. The main conservation threat to the widespread species is deforestation.
==Description==
Males are long and weigh on average . Females are slightly larger at in length and a mean weight of . The wingspan can range from .〔(ADW: Buteo lineatus: INFORMATION ). Animaldiversity.ummz.umich.edu. Retrieved on 2012-12-19.〕〔(Red-Shouldered Hawks, Red-Shouldered Hawk Pictures, Red-Shouldered Hawk Facts – National Geographic ). Animals.nationalgeographic.com (2012-12-13). Retrieved on 2012-12-19.〕〔(Red-shouldered Hawk (''Buteo lineatus'') ). Tpwd.state.tx.us. Retrieved on 2012-12-19.〕〔(Red-shouldered Hawk, Life History, All About Birds – Cornell Lab of Ornithology ). Allaboutbirds.org. Retrieved on 2012-12-19.〕 Adult birds can vary in mass from . Among standard measurements, the wing bone is long, the tail is long and the tarsus is .〔''Raptors of the World'' by Ferguson-Lees, Christie, Franklin, Mead & Burton. Houghton Mifflin (2001), ISBN 0-618-12762-3〕 Adults have brownish heads, reddish chests, and pale bellies with reddish bars. Their tails, which are quite long by ''Buteo'' standards, are marked with narrow white bars. Red "shoulders" are visible when the birds are perched. These hawks' upper parts are dark with pale spots and they have long yellow legs. Western birds may appear more red, while Florida birds are generally paler. The wings of adults are more heavily barred on the upper side. Juvenile red-shouldered hawks are most likely to be confused with juvenile broad-winged hawks, but can be distinguished by their long tails, crescent-like wing markings, and a more flapping, ''Accipiter''-like flight style. In direct comparison, it is typically larger and longer proportioned than the Broad-wing, though is slightly smaller and more slender than most other common North American ''Buteos''. This bird is sometimes also confused with the widespread red-tailed hawk. That species is larger and bulkier, with more even-sized, broad wings and is paler underneath, with a reddish tail often apparent. The Red-tail is also more likely to soar steadily, with wings in a slight dihedral.
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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