Jacchus

Jacchus is a genus of New World monkeys belonging to the family Callitrichidae. These small primates are native to the tropical forests of South America, primarily found in Brazil, Colombia, Ecuador, and Peru. The genus Jacchus is characterized by its small size, relatively short snout, and the presence of tufted ears, which are a prominent feature in many species.

There are several recognized species within the genus Jacchus, including the common marmoset (Jacchus jacchus), the black-tufted marmoset (Jacchus niger), and the pygmy marmoset (Jacchus pygmaeus), though the latter is sometimes placed in its own genus, Cebuella. Marmosets are omnivorous, with their diet consisting of fruits, insects, tree sap, and small vertebrates. They are known for their ability to gnaw through tree bark to access gum and sap, a behavior facilitated by specialized incisors.

Jacchus species are highly social animals, living in family groups that typically consist of a breeding pair and their offspring. These groups cooperate in foraging, predator defense, and infant care. Reproduction in marmosets often involves the birth of twins, and all members of the group participate in carrying and caring for the young. Their arboreal lifestyle means they are skilled climbers and leapers, spending most of their time in the trees. Marmosets communicate through a variety of vocalizations and scent marking. Their small size and agile nature help them navigate the dense forest canopy.