The Black Sicklebill is a large bird of New Guinea's mountain forests. Males have a long curved bill and tail plumes, and their dark feathers can gleam green, blue, and purple.
Males have dark plumage with green, blue, and purple iridescence, a long sickle-shaped bill, and elongated tail feathers. Females are reddish brown, with buff barring below.
It lives mainly in primary mountain forest at 1,280–2,550 m and eats fruit, insects, and small vertebrates. Males display from high perches, and females nest alone.
An extinction-risk assessment has not been added yet.