field wagtail

Webster's Dictionary (1913)

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.

From the entry Wagtail.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54