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The southern beardless tyrannulet (''Camptostoma obsoletum'') is a small passerine bird in the tyrant flycatcher family. It breeds from Costa Rica through South America south to Paraguay, Bolivia, and Argentina. ==Description== The southern beardless tyrannulet is 10.2 cm long, weighs 7.5g and often resembles a tiny yellow-bellied elaenia. The head is dark brown or grey with an erectile crest and pale supercilium. The upperparts are grey-green becoming paler on the rump. The wings are brown with yellow feather-edging and two whitish, yellowish or cinnamon wing bars. The tail, which regularly is held cocked, is brown, the throat grey, the breast yellowish, and the abdomen yellow. The bill is black, but at least the base of the lower mandible is pale. Subspecies from humid regions (e.g. the Amazon basin) are generally greener with pure yellow bellies, while subspecies of drier regions (e.g. eastern Brazil and western Ecuador) generally are greyer with duller bellies. The subspecies ''C. o. venezuelae'' occurs only in Trinidad and Venezuela, and is well distinct in plumage tone. The call is a loud whistled ''TLEEE-tee-tee-tee''. In courtship, the crests are raised, the tail flicked, and an excited mixture of the ''TLEE'' call and a churring ''pee-chrrr-pee-chrrr'' is given. Sexes are similar, and this species always appears brighter, especially with regard to the wing bars, than the closely related northern beardless tyrannulet (''C. imberbe''), with which it was once considered conspecific. However, the two forms overlap without interbreeding in central Costa Rica. 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「Southern beardless tyrannulet」の詳細全文を読む スポンサード リンク
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