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Ruby-throated hummingbird
The ruby-throated hummingbird (''Archilochus colubris'') is a species of hummingbird that generally spends the Winter in Central America and migrates to Eastern North America for the Summer to breed. It is by far the most common hummingbird seen east of the Mississippi River in North America.
== Description ==
This hummingbird is from long and has an wingspan. Weight can range from , with males averaging against the slightly larger female which averages .〔(【引用サイトリンク】title=Ruby-throated Hummingbird, Life History, All About Birds – Cornell Lab of Ornithology )〕 Adults are metallic green above and greyish white below, with near-black wings. Their bill, at up to , is long, straight, and very slender. As in all hummingbirds, the toes and feet of this species are quite small, with a middle toe of around and a tarsus of approximately . The ruby-throated hummingbird can only fox-trot if it wants to move along a branch, though it can scratch its head and neck with its feet.〔〔(【引用サイトリンク】title=John James Audubon's Description of the Ruby-throated Hummingbird )〕
The species is sexually dimorphic.〔(【引用サイトリンク】title=Hummingbird: external appearance, ageing, sexing )〕 The adult male has a gorget (throat patch) of iridescent ruby red bordered narrowly with velvety black on the upper margin and a forked black tail with a faint violet sheen. The red iridescence is highly directional and appears dull black from many angles. The female has a notched tail with outer feathers banded in green, black, and white and a white throat that may be plain or lightly marked with dusky streaks or stipples. Males are smaller than females and have slightly shorter bills. Juvenile males resemble adult females, though usually with heavier throat markings.〔Williamson (2001)〕 The plumage is molted once a year, beginning in late summer.
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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