Marmosets are highly active, living in the upper canopy of forest trees, and feeding on
insects,
fruit, leaves, tack, sap, and gum. They have strong upper and long, bent lower
incisors, which allow them to chew holes in tree trunks and branches to harvest the gum inside; some species are specialized feeders on gum. Most groups scent mark and defend the edges of their ranges, but whether they are truly territorial is unclear, as group home ranges greatly overlap. The favorite food of marmosets is carbohydrate-rich tree sap, which they reach by gnawing holes in trunks, as well as insects and smaller animals. Their territories are centered on the trees that they regularly exploit in this way. The smaller marmosets venture into the very top of forest canopies to hunt insects that are abundant there. == Research ==