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"Motacilla raii, the Yellow Wagtails, are generally black and white, grey and white, grey with a yellow breast (or even head), greenish with yellow lower parts and greyish or black heads, or almost entirely yelowish." A. H. Evans, 1900

Yellow Wagtail

"Motacilla raii, the Yellow Wagtails, are generally black and white, grey and white, grey with a yellow…

A (Motacilla alba) or White Wagtail (upper) and a (Motacilla flava) Yellow Wagtail (lower) sitting on the rocks in a grassy area. "The White Wagtail - Head black, with a broad mask of white across forehead and along side; the black extending on the fore-breast; wings blackish, with much white edging and tipping of the quills and greater coverts; tail black, the two lateral feathers on each side mostly white; back and sides ashy; lower parts mostly white; bill and feet black. In winter black more restricted, in part replaced by gray. The Yellow Wagtail has characters of the Motacilla alba; tail shorter, not exceeding the wing length; hind claw lengthened and straightish; hind toe and claw nearly as long as the tarsus. Coloration chiefly yellow and greenish." Elliot Coues, 1884

A White and Yellow Wagtail Sitting on the Rocks

A (Motacilla alba) or White Wagtail (upper) and a (Motacilla flava) Yellow Wagtail (lower) sitting on…

"The Yellow Wagtail or Motilla flava has characters of the Motacilla alva; tail shorter, not exceeding the wing length; hind claw lengthened and straightish; hind toe and claw nearly as long as the tarsus. Coloration chiefly yellow and greenish." Elliot Coues, 1884

Yellow Wagtail Head and Foot

"The Yellow Wagtail or Motilla flava has characters of the Motacilla alva; tail shorter, not exceeding…