Black Antshrike Thamnophilus nigriceps

Medium-sized antshrike found in the understory of lowland forest and edge, especially in dense thickets. Male is entirely dark glossy black with a relatively short tail and a stout, hooked bill. Female is very distinctive: rufous above with a darker blackish head and breast covered with paler streaks and a buffy-brown belly. Found in pairs, usually working their way through vine tangles or thickets. Listen for an accelerating series of clucks.