Black Antshrike

The black antshrike is 15 to 16 cm (5.9 to 6.3 in) long and weighs 23 to 24 g (0.81 to 0.85 oz). Members of genus Thamnophilus are largish members of the antbird family; all have stout bills with a hook like those of true shrikes. This species exhibits some sexual dimorphism. Adult males are almost entirely black. They have dark gray flanks and their underwing coverts and edges of the underside of their flight feathers are white. Adult females have a blackish gray head and upper breast with buff-white streaks. Their upperparts, wings, and tail are rufous-brown. Voice: The black antshrike's song is "a moderately long...slightly accelerating, evenly pitched series of somewhat musical yet emphatic notes". Its calls include a "hollow, nasal note sometimes repeated" and a "nasal growl".