The black bearded saki (Chiropotes satanas) is a species of New World monkey, native to the Amazon rainforest of South America, specifically to an area of north-eastern Brazil.

[8] The black bearded saki has some yellowish-brown highlights around the back and shoulders and can weigh from 2 to 4 kg (4.4 to 8.8 lb).

Formerly the red-backed, brown-backed and Uta Hick's bearded sakis, the other member of the genus Chiropotes, were classified as subspecies or taxonomically insignificant variations of the same species called the bearded saki, but based on pelage differences and molecular analysis it has been recommended to treat them as separate species.

Individuals of a troop will separate and rejoin throughout the day, have large home ranges, and travel long distances daily.

[1] Habitat fragmentation is rising as secondary roads increase and people move into uninhabited areas of the Amazon rainforest.

Along with an influx of people the amount of agriculture required to support the area increases, augmenting the pressure for deforestation.

[14] Forest fragmentation has resulted in behavioral changes that allow the species to adapt but could be detrimental for its conservation status in the long run.

Shifts in feeding patterns occur where fragmentation has been accompanied by selective logging of species used by black bearded sakis as food.

The black bearded saki is considered the most endangered primate in the Amazon and is already locally extinct in a large portion of its original range.

Groups of black bearded saki living in 10 ha (25 acres) fragments of isolated rainforest showed a lack of reproduction in a period of 3.5 years.

[5] It is unknown if the species will be able to reproduce and achieve healthy populations in the smaller patches of fragmented forest they are forced to inhabit.