Hairy saki

It was described in 1823 by Johann Baptist von Spix, but was later merged with the monk saki (P. monachus). However, a 2014 study revived it as a distinct species based on differences in pelage coloration. The American Society of Mammalogists, IUCN Red List, and ITIS all follow this classification.[2][3][1][4]

This species is found roughly at the intersection between Brazil, Peru, and Colombia, and ranges west of the Rio Negro, north of the Solimões River & Napo River, and south of the Japurá River. It is not known how far west it occurs, and where the boundary between this species and Miller's saki (P. milleri) is.[3][1]

It can be considered the most uniform and plain of the sakis, with very little differences in coloration between males and females. Both are largely blackish agouti in coloration.[3]

This species is thought to be threatened by logging & poaching and thus its population is thought to be declining. They are sometimes also found in the pet trade. However, this species remains poorly-known and it is thus classified as data deficient on the IUCN Red List.[1]