We know very little about Geoldi's as field studies of them are rare. The Geoldi's has been found in mature forests, bamboo forests, some noticed they are frequently found in the understorey, and on the ground to catch insects. Although they do feed on the tops of tall fruiting trees, they will flee to the understorey if threatened. Other studies suggest they prefer swampy areas near rivers and streams. The Geoldi's eats fruits and insects.
Some studies show they also eat tree gums like marmosets.
Usually single offspring, rarely twins. Gestation 139-180 days. Females mature at 8 months, males in about a year. Sparsely distributed in the upper reaches of the Amazon from southern Columbia, northern Boliva, Eastern Ecuador, northwest Brazil and Peru. Deep in primary forests, secondary forest and bamboo thickets, rarely near human habitation.