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Such a habit could hardly fail to become hereditary, so that the daughter of a cuckoo which always put her egg into a reed-wren’s, titlark’s or wagtail’s nest would do as did her mother.

Wagtail, wag′tāl, n. any bird of the family Motacillid�, so named from their constant wagging of the tail—the pipits or titlarks, &c.:

Pipit, pip′it, n. a genus of birds resembling larks in plumage and wagtails in habits, the most common British species being the titlark.

All through the long dark winter the wren and titlark sing cheerfully.

Its descent after the song is finished is very rapid, and precisely like that of the titlark when it sweeps down from its course to alight on the ground.