Southern Bristle Tyrant

The southern bristle tyrant measures about 11 to 11.5 cm (4.3 to 4.5 in) in length; one male weighed 7.5 g (0.26 oz). Both sexes share the same plumage. Adults feature a gray crown and nape with an olive tint in the middle of the crown. A wide white streak at the lores narrows and becomes grayer over and past the eye to the nape. Their ear coverts are yellow bisected by a wide black crescent. Their back, rump, and tail are bright olive. Their wings are dusky with yellowish olive edges on the flight feathers and wing coverts. Voice: The southern bristle tyrant's song is an "extr. high, energetic, strident, rattling 'vrrrrrjeh' trill" lasting one or two seconds.