The squirrel monkeys are the New World monkeys of the genus Saimiri. They are the only genus in the subfamily Saimirinae. The name of the genus Saimiri is of Tupi origin and was also used as an English name by early researchers.Squirrel monkeys live in the tropical forests of Central and South America in the canopy layer. Most species have parapatric or allopatric ranges in the Amazon, while S. oerstedii is found disjunctly in Costa Rica and Panama.The common squirrel monkey is captured for the pet trade and for medical research but it is not threatened. Two squirrel monkey species are threatened: the Central American squirrel monkey and the black squirrel monkey are listed as Vulnerable by the Squirrel monkey fur is short and close, colored olive at the shoulders and yellowish orange on its back and extremities. Their throat and the ears are white and their mouths are black. The upper part of their head is hairy. This black-and-white face gives them the name "death's head monkey" in several Germanic languages and Slovenian. Squirrel monkeys grow from 25 to 35 cm long, plus a 35 to 42 cm tail. Male squirrel monkeys weigh 750 to 1100 g. Females weigh 500 to 750 g. They are equipped with a long and hairy tail, flat nail, small hallux and curved, pointed claws.
Female squirrel monkeys have a pseudo-penis that they use to display dominance over smaller monkeys in much the same way the male squirrel monkeys display their dominance.
Source: picture:Link: Wikipedia:Link: