In the wild, the bird has hybridised with the Arfak astrapia to create offspring that were once considered two distinct species, the Elliot's sicklebill (Epimachus ellioti) and the astrapian sicklebill (Astrapimachus astrapioides). Both species are generally viewed by most mainstream ornithologists as hybrids, but a minority of ornithologists believe ellioti may be a valid species.
Ongoing habitat loss, small population size, and hunting in some areas for food and its tail feathers are areas of concern. The black sicklebill is classified as Least Concern on the IUCN Red List of Threatened Species. It is listed on Appendix II of CITES.
The male has black plumage with iridescent green, blue and purple scale-like feathers, red irises, bright yellow mouth, long curved black bill, huge sabre-shaped tail and large erectile fan-like plumes on the sides of its breast. The female is smaller than the male, with reddish brown plumage, brown irises, and buff below. Reaching up to 110 cm in length, the male black sicklebill is the longest member of Paradisaeidae, though the curl-crested manucode has a larger body.
- Epimachus fastosus atratus
- Epimachus fastosus fastuosus
- Epimachus fastosus stresemanni
- Epimachus fastosus ultimus
- BirdLife International. 2017. Epimachus fastosus. The IUCN Red List of Threatened Species 2017: e.T22706151A118228172. https://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T22706151A118228172.en. Downloaded on 31 December 2018.
- Perrins, Christopher, Firefly Encyclopedia of Birds. Firefly Books. ISBN 1-55297-777-3
- BirdLife International (2004). "Epimachus fastuosus". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 11 May 2006. Database entry includes a range map and justification for why this species is vulnerable
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