A large, long-tailed bird of montane forest with a long, curved bill. Male has black upperparts with some iridescence, brown underparts and very long tail. Female is brown above with rufous crown, barred belly and black face. Male does an astonishing display, where two articulated fans are lifted above the head and the whole body is swayed up and down. Similar to Black Sicklebill, but Brown is usually found at higher elevations and has a pale blue eye. Male has brown and female a barred chest. Voice, sounds scarily like short bursts of a machine gunfire.