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n. (Zool.) Any one of many species of Old World singing birds belonging to Motacilla and several allied genera of the family Motacillidæ. They have the habit of constantly jerking their long tails up and down, whence the name. Field wagtail, any one of several species of wagtails of the genus Budytes having the tail shorter, the legs longer, and the hind claw longer and straighter, than do the water wagtails. Most of the species are yellow beneath. Called also yellow wagtail.

 - Garden wagtail, the Indian black-breasted wagtail

 - Pied wagtail, the common European water wagtail (Motacilla lugubris). ...