The Napo saki[1] (Pithecia napensis), also called the Napo monk saki, is a species of saki monkey, a type of New World Monkey.
- Its range includes parts of northern Peru and eastern Ecuador. Napo-Sakis show slight sexual dimorphism.
- Male species have a black body, a dense coat of short white hairs on the crown, and a gray facial disc.
- They also sport a reddish or orange ruff on their chest. Female species are gray overall, with no facial disc or crown coloration.
- Their frill is brown and more subtle than that of the male species. Napo-sakis have particularly long hair around their faces and necks.
- Their tails are also covered in long hair, giving them a very bushy appearance.
