The common or white tufted ear marmoset occurs in Brazil, where their habitat ranges from the edge of forests into the deep forests, but they also appear in fields. Like the pygmy marmoset Callithrix jacchus is a gum-feeding specialist, with gouging lower incisors to excavate holes in gum-producing trees to guarantee gum year-round. Common marmosets live together in family groups of four to 15 animals, usually mated adults and their offspring. All adults and subadults share in the care of the young. The IUCN classifies this species as LEAST CONCERN.”