The marmosets (/ˈmɑːrməˌzɛts, -ˌsɛts/),[3][4] also known as zaris or sagoin, are twenty-two New World monkey species of the genera Callithrix, Cebuella, Callibella, and Mico.

Relative to other monkeys, they show some apparently primitive features; they have claws rather than nails, and tactile hairs on their wrists.

Marmosets are highly active, living in the upper canopy of forest trees, and feeding on insects, fruit, leaves, tack, sap, and gum.

Like other callitrichines, marmosets are characterized by a high degree of cooperative care of the young and some food sharing and tolerated theft.

[citation needed] The favorite food of marmosets is carbohydrate-rich tree sap, which they reach by gnawing holes in trunks.