Usage examples for wagtail:

• Because you are a little wagtail Reginchen. "The Children of the World" – Paul Heyse

• His mother and the nurse were dismissed from the room, and then the water- wagtail in her gratitude had bent over him, had raised his pretty face a little, and had given him two such sweet kisses that the poor boy had been quite uneasy. "The Complete Historical Romances of Georg Ebers" – Georg Ebers

• When red- starts shake their tails they move them horizontally, as dogs do when they fawn: the tail of a wagtail when in motion, bobs up and down like that of a jaded horse. "The-Natural-History-of-Selborne" – White, Gilbert

• The baby- wagtail bolted several meals, fluttering its greedy little wings, while Annette said to herself over and over again, half stupefied- Dick is Mr. Manvers. "Notwithstanding" – Mary Cholmondeley