The silvery marmoset (Callithrix argentata) is a New World monkey that lives in Brazil, south and east of the Amazon basin. Compared to other marmosets, they have a very isolated habitat.
The fur of the Silvery Marmoset is colored whitish silver-grey except for a dark tail. Remarkable are its naked, flesh-colored ears that stand out from the skin. They reach a size of 7.09 to 11.02 in (18 to 28 cm) and weigh from 10.58 to 14.11 oz (300 to 400 g).
Silvery marmosets are diurnal and arboreal, using their claws to climb trees. Plantations have caused them to expand their range. They spend the night in tree hollows or in very close vegetation. They live together in small groups and mark their territory with scent glands. They drive out intruders by shouting or by facial expressions (lowered brows and guarded lips).
The diet of the silvery marmosets predominantly consists of tree sap. Sometimes, they also eat bird eggs, fruits, insects, and small vertebrates.
After a 145-day gestation period, the female bears two (or rarely three) offspring. The father and the other group members take part with the raising of the offspring. Within six months the young are weaned, with full maturity coming at about two years of age.