Red-rumped Bush Tyrant

The red-rumped bush tyrant is 20 to 23 cm (7.9 to 9.1 in) long. One female weighed 50 g (1.8 oz). The sexes have the same plumage. Adults of the nominate subspecies have a white forecrown that becomes a hoary gray crown. Their back is dark gray brown and their rump is rufous. Their wings are dark gray brown with much white on the tertials that shows as a conspicuous patch in flight. Their central tail feathers are blackish and the rest are rufous with blackish end quarters. Their chin and throat are white with thin dusky streaks. Voice: The red-rumped bush tyrant is not highly vocal. What is believed to be its song is "a rather unpatterned series of mellow mewed whistles and rich churring notes". Some calls are a "loud, piercing, clear TEEER!, PEEP, pee-ip, and tew notes and burrier dzeeer and djip notes". Other calls are described as "a shrill kyeee", "a higher-pitched skyeik", and "a high-pitched plaintive whistle, wheeeu".