Hudson's Black Tyrant

Hudson's black tyrant is about 15 to 15.5 cm (5.9 to 6.1 in) long. Adult males are almost entirely shiny black. Their wings have a wide white band on the inner webs of the primaries that is very conspicuous in flight but usually hidden when perched. They also has some whitish on the lower flanks. Adult females have a mostly grayish brown head and upperparts with a rufous rump and basal half of the tail. The rest of the tail is grayish brown with a blackish band across the end. Their wings are dusky with buff tips on the coverts that show as two wing bars.