The Sagui (Callithrix jacchus), from the Tupi language “sauín”, also known as Soim or Mico. The Sagui are squirrel-sized monkeys from the family Callitrichidae in the genus Saguinus. They are closely related to the Mico leão in the genus Leontopithecus. Saguis are found in the Amazon and Atlantic Forest biomes. They are diurnal and arboreal, and run and jump quickly through the trees. They live together in groups of up to 40 members consisting of one or more families. They are omnivores, eating fruits and other plant parts as well as spiders, insects, small vertebrates and bird eggs.