Marmosets live in tropical or subtropical forests of South America. They run and hop in trees and bushes and are capable of leaping.
Marmosets are among the smallest primates.
Once considered primitive, squirrel-like primates, new evidence suggests they are advanced, both morphologically and ecologically. They do lack the wisdom teeth of other primates. The forelimbs are shorter than the hind limbs. Thumbs are not opposable. The hand and foot are elongated, and all digits bear pointed, sickle shaped nails, except the great toe, which has a flat nail.