The squirrel monkeys are the New World monkeys of the genus Saimiri. They are the only genus in the subfamily Saimirinae. Squirrel monkeys live in the tropical forests of Central and South America in the canopy layer. Most species have para- or allopatric ranges in the Amazon, while S. oerstedii is found disjunctly in Costa Rica and Panama. 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".