Distribution Geoffroy's tufted-eared marmosets inhabit Brazil. Habitat Their preferred habitat is secondary lowland, evergreen, and semideciduous forest. Diet Geoffroy's tufted-eared marmosets feed on fruit, small animals and insects. They are diurnal and arboreal, and typically live in groups of 8-10. They move through the forest quadrupedally, but they are capable of leaping.
Males coil their tails as a sexual display previous to copulation.
The IUCN classify these marmosets as vulnerable.