Like other members of its genus, the Santarem marmoset travels in the lower parts of the forest canopy, and feed primarily on fruit and insects, supplementing its diet with small lizards and frogs and with gum gouged from trees.[1] They live in small family groups, with about six members being typical,[2] although groups of up to fifteen individuals have been reported.[3] They make long calls with their tongue vibrating rapidly, said to resemble the sound of a cricket, and also shorter chirps.