Grey Wagtail (Motacilla cinerea)

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Grey
Wagtail (Motacilla cinerea) by
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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.

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Seem like we have many similar bird ...

juvy?