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Kinglet
A kinglet, or crest, is a small bird in a group that is sometimes included in the Old World warblers, but is frequently placed in its own family, Regulidae, because of resemblance to titmice. "Regulidae" is derived from the Latin word ''regulus'' for "petty king" or prince, and refers to the coloured crowns of adult birds. This family has representatives in North America and Eurasia. There are seven species in this family; one, the Madeira firecrest, ''Regulus madeirensis'', was only recently split from common firecrest as a separate species. One species, the ruby-crowned kinglet, differs sufficiently in its voice and plumage to occasionally be afforded its own genus, ''Corthylio''.
==Description==
Kinglets are among the smallest of all passerines, ranging in size from 8–11 cm (3.2–4.3 in) and weighing 6–8 g (0.2–0.3 oz); the sexes are the same size. They have medium-length wings and tails, and small needle-like bills. The plumage is overall grey-green, offset by pale wingbars, and the tail tip is incised. Five species have a single stiff feather covering the nostrils, but in the ruby-crowned kinglet, this is replaced by several short, stiff bristles. Most kinglets have distinctive head markings, and the males possess a colourful crown patch. In the females, the crown is duller and yellower. The long feathers forming the central crown stripe can be erected; they are inconspicuous most of the time, but are used in courtship and territorial displays when the raised crest is very striking.〔
There are two species in North America with largely overlapping distributions, and two in Eurasia which also have a considerable shared range. In each continent, one species (goldcrest in Eurasia and golden-crowned kinglet in North America) is a conifer specialist; these have deeply grooved pads on their feet for perching on conifer twigs, and a long hind toe and claw for clinging vertically. The two generalists, ruby-crowned kinglet and common firecrest hunt more in flight, and have smoother soles, shorter hind claws and a longer tail.〔
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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