Cocha Antshrike

The cocha antshrike is about 16 cm (6.3 in) long. 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 sexual dimorphism. Adult males are entirely black except that their underwing coverts are white, a feature that is seldom visible in the field. Adult females have a black head, throat, and upper breast. Some individuals have faint white streaks on their throat. The rest of their body, their wings, and their tail are cinnamon-rufous; their underparts are slightly paler than their back. Voice: The cocha antshrike's song is "a hollow, evenly paced ko-ko-ko-ko-ko-ko-ko-ko-ko-ko"; it sometimes follows it with a shorter and higher pitched version of the song. Its calls include "a mellow 'pwow-pwow' and a more trilled 'krrrrrr' ".