The Aracá uakari[1], also called the Ayres black uakari, is a newly described monkey species endemic to the northwestern Brazilian Amazon.
- Uakaris are odd among New World monkeys in that tail length (15 to 18 cm) is significantly less than head and body length (40-45 cm).
- Their bodies are draped with long flowing hair, but their heads are bald. They have nearly no subcutaneous fat, so their bald faces look almost like skulls.
- Like saki monkeys – their closest relatives – they have to protrude lower incisors.
- These monkeys also have the primate’s most distinctive red facial skin.
