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black robin : ウィキペディア英語版
black robin

The black robin or Chatham Island robin (''Petroica traversi'') is an endangered bird from the Chatham Islands off the east coast of New Zealand. It is closely related to the South Island robin (''P. australis''). It was first described by Walter Buller in 1872.〔The binomial commemorates the New Zealand botanist Henry H. Travers (1844–1928). The new guide to the birds of New Zealand and outlying islands. Collins, Auckland.〕 Unlike its mainland counterparts, its flight capacity is somewhat reduced. Evolution in the absence of mammalian predators made it vulnerable to introduced species such as cats and rats, and it became extinct on the main island of the Chatham group before 1871, being restricted to Little Mangere Island thereafter.
==Description==

The black robin is a small, sparrow-sized bird measuring 10–15 cm (5.5–6 in). Its plumage is almost entirely brownish-black, with a black bill and brownish-black yellow-soled feet.〔Falla, R. A., R. B. Sibson, and E. G. Turbott (1979)〕
Females are usually slightly smaller than males. Male songs are a simple phrase of 5 to 7 notes. Its call is a high pitched single note. Their eyes are dark brown. The birds will moult between December and March.

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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