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Baltimore oriole
The Baltimore oriole (''Icterus galbula'') is a small icterid blackbird common in eastern North America as a migratory breeding bird. It received its name from the resemblance of the male's colors to those on the coat-of-arms of Lord Baltimore. Like all New World orioles, it is named after an unrelated, physically similar family found in the Old World: the Oriolidae. Observations of interbreeding between the Baltimore oriole and the western Bullock's oriole, ''Icterus bullockii'', led to both being classified as a single species, called the northern oriole, from 1973-1995. Research by James Rising, a professor of zoology at the University of Toronto, and others showed that the two birds actually did not interbreed significantly.〔(Oriole Name Migrates to Baltimore ). Baltimore Sun, March 7, 1995. Retrieved on 2015-05-23.〕
The Baltimore oriole is the state bird of Maryland. It is also the inspiration for the Baltimore Orioles baseball club.
==Description==
This medium-sized passerine measures in length and spans across the wings. Their build is typical of icterids, as they have a sturdy body, a longish tail, fairly long legs and a thick, pointed bill. The body weight averages , with a range of weights from .〔''CRC Handbook of Avian Body Masses'' by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.〕 The male oriole is slightly larger than the female, although the size dimorphism is minimal by icterid standards.〔(Baltimore Oriole, Life History, All About Birds – Cornell Lab of Ornithology ). Allaboutbirds.org. Retrieved on 2012-08-23.〕〔(ADW: Icterus galbula: INFORMATION ). Animaldiversity.ummz.umich.edu. Retrieved on 2012-08-23.〕〔(Baltimore Orioles, Baltimore Oriole Pictures, Baltimore Oriole Facts – National Geographic ). Animals.nationalgeographic.com. Retrieved on 2012-08-23.〕 Adults always have white bars on the wings. The adult male is orange on the underparts shoulder patch and rump, with some birds appearing a very deep flaming orange and others appearing yellowish-orange. All of the rest of the male's plumage is black. The adult female is yellow-brown on the upper parts with darker wings, and dull orange-yellow on the breast and belly. The juvenile oriole is similar-looking to the female, with males taking until the fall of their second year to reach adult plumage.
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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