Lesser Wagtail-Tyrant

The lesser wagtail-tyrant is 13 cm (5.1 in) long. The sexes have the same plumage; males are slightly larger than females. Adults have a thin pale yellow supercilium, an indistinct pale yellow eye-ring, and a blackish line through the eye on an otherwise pale yellowish face. Their crown and upperparts are grayish olive. Their wings are dusky with wide white edges on the innermost flight feathers and the coverts; the last show as a large white patch on the closed wing. Their tail is long and dusky. Voice: The lesser wagtail-tyrant sings from a perch in small bushes and mainly in the early morning and late afternoon. The Amazon Basin population sings a "lively rollicking asynchronous duet, one bird uttering a descending rattle, the other uttering repeatedly a melodious note". The rattle has six to 12 notes, descends in pitch, and accelerates near the end, sounding like a bouncing ball.