Grey-and-white Tyrannulet

The grey-and-white tyrannulet is about 12.5 cm (4.9 in) long and weighs 10 to 11 g (0.35 to 0.39 oz). The sexes have the same plumage. Adults have a pale grayish brown crown with a shaggy crest whose white center is exposed when erect. They have a white supercilium and a black line through the eye on an otherwise grayish white face. Their upperparts are pale grayish brown and their tail gray. Their wings are dusky with narrow white edges on the flight feathers and coverts; they show as wing bars on the latter. Voice: The grey-and-white tyrannulet's dawn song is "a squeaky pit'i'pew or sneezy pit'chew interspersed with a rising weee-wit" and its call is "a squeaky, nasal tchuEE? or tchu'bit".