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grey wagtail
The grey wagtail (''Motacilla cinerea'') is a small member of the wagtail family, Motacillidae. The species looks similar to the yellow wagtail but has the yellow on its underside restricted to the throat and vent. Breeding males have a black throat. The species is widely distributed, with several populations breeding in Europe and Asia and migrating to tropical regions in Asia and Africa. They are usually seen on open marshy ground or meadows where they walk solitarily or in pairs along the ground, capturing insects that are disturbed. Like other wagtails, they frequently wag their tail and fly low with undulations and they have a sharp call that is often given in flight.
==Taxonomy and systematics==
This species was first described by Marmaduke Tunstall in his 1771 Ornithologia Britannica.
The relationships of this species are not well resolved; it belongs to the non-African clade of wagtails, these are confusing in their external morphology, and mtDNA cytochrome ''b'' and NADH dehydrogenase subunit 2 sequence data are not able to robustly resolve their relationships. While the present species is probably most closely related to citrine wagtails and some blue-headed wagtails, the exact nature of this relationship is unclear.
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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