Cacajao calvus , C. melanocephalus

The only American monkey with a short tail, the uakari is visually distinct. The red uakaris have a bright red face that is practically hairless, but they sometimes exhibit a well developed beard. Their colour ranges from red, to orange, through to white.  The white uakari is the rarest and confined to a small area of north western Brazil. The black headed uakaris have their arms, shoulders, and heads covered with black fur. Uakaris are the most habitat restricted of all American primates, and live only along small lakes and rivers. They normally occur in troops of 10 individuals but can be seen in groups of 100 or more. Both species of uakari are endangered. This is mainly by habitat destruction, but also hunting and the pet trade

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