Saimiri sciureus, S. oerstedii, S. boliviensis, S. vanzolini
Squirrel monkeys are small primates native to tropical rainforests in Central and South America. Four similar-looking species are recognized. In the wild they live in large social groups of up to 200 individuals and spend most of their time foraging in the trees for fruits, seeds, and insects. They typically live for 15 to 20 years.
Squirrel monkeys are difficult to breed in captivity, so wild individuals are commonly trapped and imported to the U.S. for medical research purposes.