Yellow wagtail

The yellow wagtail (Motacilla flava) is a slender, long-tailed, long-legged bird most often seen walking on the ground near water courses with the tail wagging fervently. This attractive bird has been the subject of much debate due to its complex taxonomy. It varies hugely in appearance across its large range, with some authorities considering many of the subspecies separate species (2). In general, the yellow wagtail is a graceful yellow and green bird, with a greyish to black bill and slate-grey to black legs

www.arkive.org/yellow-wagtail/motacilla-flava/

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