White Wagtail, Lavandera blanca

Small passerine bird in the wagtail family Motacillidae. The White Wagtail is an insectivorous bird of open country, often near habitation and water. The White Wagtail is a slender bird, 16.5–19 cm in length, with the characteristic long, constantly wagging tail of its genus.
The nominate subspecies Motacilla alba alba is basically grey above and white below, with a white face, black cap and black throat.