The Black sicklebill (Epimachus fastosus), is a species of large bird-of-paradise of midmountain forests of New Guinea. The sicklebill's diet consists mainly of fruits and arthropods. The male of the species is polygamous and performs a horizontal courtship display with the pectoral plumes raised around its head. Due to ongoing habitat loss, small population size, and hunting in some areas for food and its tail feathers, the black sicklebill is classified as Vulnerable on the IUCN Red List of Threatened Species. It is listed on Appendix II of CITES.