Sao Francisco Black Tyrant

The Sao Francisco black tyrant (Knipolegus franciscanus), also known as the caatinga black tyrant or Brazilian black tyrant, is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is endemic to Brazil. == Taxonomy and systematics == The Sao Francisco black tyrant was formally described in 1928 as a subspecies of the white-winged black tyrant (K. aterrimus). By 2008 BirdLife International's Handbook of the Birds of the World (HBW) had treated it as a full species. Following a 2012 publication that confirmed its status, other taxonomic systems followed suit, variously calling it the Sao Francisco black tyrant and caatinga black-tyrant. The Sao Francisco black tyrant is monotypic. == Description == The Sao Francisco black tyrant is 16 to 16.5 cm (6.3 to 6.5 in) long. One female weighed 20.5 g (0.72 oz). Adult males are almost entirely shiny black. Their wings have a wide white band at the base of the primaries that is conspicuous in flight but usually hidden when perched. Adult females have a mostly brownish gray head and upperparts with a rufous-buff rump, uppertail coverts, and base of the tail. The rest of their tail is dark. Their wings are brownish gray with whitish…