sa·ki 2 
(säkē)
(säkē)n. pl. sa·kis
Any of several small omnivorous arboreal monkeys of the genera Pithecia and Chiropotes of northern and central South America, having long legs and a long bushy nonprehensile tail.
[French, shortening (given as a name to a species of saki by Georges Louis Leclerc de Buffon) of English sakee winkee, sakiwinki, ultimately from Tupí sagui or a kindred Tupí-Guaraní source.]