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The white-chested emerald (''Amazilia brevirostris'') is a hummingbird found in eastern Venezuela, the Guianas, Trinidad and far northern Brazil (Roraima). It has sometimes been placed in the genus ''Agyrtria'', and the name ''A. chionopectus'' was formerly used for this species, as the name ''A. brevirostris'' was believed to be applicable to the versicoloured emerald. While most current authorities maintain the view that ''A. brevirostris'' is the correct name for the white-chested emerald, it has recently been suggested that this is incorrect, in which case its scientific name would revert to ''A. chionopectus''. It is a widespread and common species in Trinidad, less so in Venezuela. It appears to be a local or seasonal migrant, although its movements are not well understood. It is a bird of cultivation, woodland and forest. The female lays her eggs in a small cup nest made of plant fibre and placed on a horizontal tree branch. The white-chested emerald is approximately 9 cm long and weighs 4.7 g. The black bill is straight and fairly long, at nearly 2 cm. It has bright golden-green upperparts, becoming bronze on the tail, white underparts, and its flanks are green, or white spotted with green. The tail is tipped with purple-black. The sexes are similar. White-chested emeralds feed on nectar, usually taken from the flowers of large trees, but sometimes from smaller plants such as ''Heliconia''. They also take small insects. The song of this species is a churring ''tche-tche-tche-tche-tche''. == References == * * * Chebez, J. C., R. Castillo, R. Güller, & L. Castillo. (2008). ''Sobre la situación taxonómica de Amazilia brevirostris (Lesson, 1829) y su presencia en la Argentina.'' Las Ciencias 1: 67-81. 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「White-chested emerald」の詳細全文を読む スポンサード リンク
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