Epimachus is a genus of birds-of-paradise (Paradisaeidae) that includes two species, found in the highland forests of New Guinea.

[2] Sicklebills often associate with astrapias, which are superficially similar but have a short, straight bill and blunt-tipped tail, and the male's wings hiss in flight.

The males of these birds are highly eccentric, with hyperbolically long, saber-like, black tails that reach around 18 inches (46 cm) alone.

There is extensive green/purple iridescent highlights found on the head and back of the adult male;[2][7] additionally, blue gloss is present on the tail.

Sicklebills are endemic to New Guinea, sympathetically inhabiting areas of montane rainforest and cloud forest along the central mountainous axis of the island.