This small primate is native to the jungles and forests of South-east Brazil, in particular, in the states of Minas Gerais and Espíritu Santo. The fur on its body is dark with long, black ear tuffs and their cheeks and forehead are white. Its tail is banded.
The Geoffroy's Marmoset likes to live in trees and is active during the day, living in small groups of 4 to 5 members defending their territory whose size depends mainly on the availability and distribution of their food source. These territories are defended by the group through aggressive postures and by marking the territory with their smell against intruding fellow species.
They feed on fruits, flower nectar, resin, insects, snails, and small vertebrae. Similar to nearly all marmosets, they are currently an endangered species because of the deforestation in the Brazilian Amazon forest.