Yellow-billed Tit-Tyrant

The yellow-billed tit-tyrant (Anairetes flavirostris) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Chile, Peru, and as a vagrant in Uruguay. == Taxonomy and systematics == The members of genus Anairetes are known commonly as tit-tyrants because their active foraging behavior and crests are reminiscent of the true tits in the family Paridae. The genus had formerly been named Spizitornis. The yellow-billed tit-tyrant has these four subspecies: A. f. huancabambae (Chapman, 1924) A. f. arequipae (Chapman, 1926) A. f. cuzcoensis (Chapman, 1924) A. f. flavirostris Sclater, PL & Salvin, 1876 == Description == The yellow-billed tit-tyrant is 10 to 12 cm (3.9 to 4.7 in) long and weighs 6 to 7 g (0.21 to 0.25 oz). The sexes have the same plumage. Adults of the nominate subspecies A. f. flavirostris have a blackish split crest formed by elongated feathers on the sides of the crown. Their forecrown is dusky gray with faint white streaks, the rest of their crown is white, their supercilium is white, and the rest of their face is white with bold black streaks. Their upperparts are medium gray-brown with faint blackish streaks. Their wings…