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''Ergaticus'' was a genus of New World warblers — small passerine birds found only in the Americas. It was subsumed into ''Cardellina'' in 2011. The name is the Latinized version of the Ancient Greek ''ergatikos'', meaning "willing or able to work". The genus contains two sister species: the red warbler, which is endemic to the Mexican highlands north of the Isthmus of Tehuantepec, and the pink-headed warbler, which is found south of the Isthmus, from the highlands of Chiapas, Mexico down into Guatemala. Though they are separated by geography and differ considerably in plumage, the two have sometimes been considered to be conspecific. Both are average-sized warblers. Adult plumage is largely red, while juvenile plumage is largely "pinkish cinnamon-brown". The bill is small and narrow at the base even for a New World warbler. The tail is rounded and relatively long (Ridgway 1902). The songs consist of high-pitched chips and short trills (Howell and Webb 1995). They live in forests at altitudes of . They occur singly or in pairs and may join mixed-species feeding flocks (Howell and Webb 1995). The nest is shaped like an old-fashioned oven with an opening to the top or side, made of pine needles, grass, or similar materials. It is placed on the ground or on a bank. Both can lay 3 or 4 eggs; the pink-headed warbler sometimes lays only 2. The eggs are off-white with reddish-brown and gray speckles (Howell and Webb 1995). ==Taxonomy== Spencer Fullerton Baird created the genus ''Ergaticus'' in 1865, using it to separate several species from what he felt was the closely related genus ''Cardellina''. Prior to the creation and widespread acceptance of this genus, the red warbler and pink-headed warbler were placed in various other warbler genera, including ''Setophaga'' (with the American redstart), ''Cardellina'' (with the red-faced warbler), and ''Basileuterus'' (a widespread genus of tropical warblers) — as well as the Old World warbler genus ''Sylvia'' and the Old World tit genus ''Parus''. Recent DNA analysis shows that ''Ergaticus'' falls comfortably within the New World warbler clade, along with 18 other genera. It is closest to the genus ''Cardellina'', with which it shares a common ancestor, and slightly more distantly related to the genus ''Wilsonia''. There are two sister species, separated by the low-lying Isthmus of Tehuantepec, in the genus. The red warbler, ''E. ruber'', is found in the Mexican highlands north of the isthmus. Its three subspecies, which differ slightly in appearance, are found in three disjunct populations. The pink-headed warbler, ''E. versicolor'', is found south of the isthmus, in the highlands of Chiapas, Mexico and western Guatemala. It is monotypic across its limited range. Though they are separated by geography and differ considerably in plumage, the two have sometimes been considered to be conspecific. ''Ergaticus'' is the Latinized version of the Ancient Greek ''ergatikos'', meaning "willing or able to work". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ergaticus」の詳細全文を読む スポンサード リンク
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