Fan-tailed Warbler

The fan-tailed warbler (Euthlypis lachrymosa) is a species of bird in the family Parulidae, the New World warblers. It is the only species placed in the genus Euthlypis. It is found from Mexico to Nicaragua. It has also been recorded as a vagrant in the U. S. states of Arizona, New Mexico, and Texas. Its "habit of constant tail-fanning and tail-swinging [is] distinctive".