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covert feather : ウィキペディア英語版 | covert feather
A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or ''tectrices''), which, as the name implies, cover other feathers. The coverts help to smooth airflow over the wings and tail. ==Ear coverts== The ear coverts are small feathers behind the bird's eye which cover the ear opening (the ear of a bird has no external features)
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「covert feather」の詳細全文を読む
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