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House wren
The house wren (''Troglodytes aedon'') is a very small songbird of the wren family, Troglodytidae. It occurs from Canada to southernmost South America, and is thus the most widely distributed bird in the Americas.〔 It occurs in most suburban areas in its range and it is the single most common wren. Its taxonomy is highly complex and some subspecies groups are often considered separate species.
==Description==
Adults are long, with a wingspan and weigh about .〔(House Wren, Life History, Cornell Lab of Ornithology ). Allaboutbirds.org. Retrieved on 2013-03-18.〕 Among standard measurements, the wing chord is , the tail is , the culmen is and the tarsus is .〔Brewer, David & Sean McMinn (2001). ''Wrens, Dippers, and Thrashers: A Guide to the Wrens, Dippers, and Thrashers of the World.'' Yale University Press. ISBN 978-0300090598.〕 The subspecies vary greatly, with upperparts ranging from dull greyish-brown to rich rufescent-brown, and the underparts ranging from brown, over buff and pale grey, to pure white. All subspecies have blackish barring to the wings and tail, and some also to the flanks. All subspecies show a faint eye-ring and eyebrow and have a long, thin bill with a blackish upper mandible, and a black-tipped yellowish or pale grey lower mandible. The legs are pinkish or grey. The short tail is typically held cocked.〔Peterson, Roger Tory (1947). ''A Field Guide to the Birds: Eastern Land and Water Birds'', Houghton Mifflin Co., Boston, p. 121.〕
This bird's rich bubbly song is commonly heard during the nesting season but rarely afterwards. There is marked geographical variation in the song, though somewhat more gradual than in the bird's outward appearance that can strikingly differ, e.g., on neighboring islands in the Caribbean.〔 Birds from far north and south of the species' range nonetheless have songs that differ markedly.〔
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