Sharp-tailed Grass Tyrant

The sharp-tailed grass tyrant is 10 to 11 cm (3.9 to 4.3 in) long. The sexes have almost the same plumage; females are slightly smaller than males with a shorter tail. Adult males have a slightly bushy blackish crown and females a browner one. Both sexes have a wide white supercilium and a thin black line through the eye on an otherwise warm buffy brown face. Their back and rump are buffy brown with wide blackish streaks. Their wings are buffy brown with black and pale buff streaks and edges. Their tail is highly graduated. Voice: The sharp-tailed grass tyrant's song is "a series of weak, short, ascending burry whistles, 'tweee tweee tweee' " and is thought to be sung only by the male. Its call is "a series of unmusical 'tick' notes".