Species:  The callimico is the only species in the genus Callimico Goeldii because scientists have had difficulty categorizing them with other groups of primates. The Callimico is small and has claws like a Tamarin, but has a bigger skull and similar teeth to Old World monkeys. Some scientists think the Callimico could be the missing link between Old World and New World monkeys.

Lifespan: Callimicos live to be about 10-17 years old.

Size & Weight: Callimicos are about 10 inches (26 cm) tall, have a tail that is 10-12 inches long and weigh about1-2 lbs.

Habitat: Callimicos live in the South American Amazon Rainforest. There, they spend most of their time traveling and living within the lower 16 feet of the forests canopy. However, they will go as high as the tree tops or as low as the ground to retrieve food. Callimicos are diurnal, so they spend their days being active and retreat into a tree hole to sleep with their families for the night.

Family Life: Callimicos live in extended family groups of about 5-10. These groups consist of mating pairs and their offspring. Female Callimicos spend the first 20 days with their baby, but after that, other members of the group help raise the babies. Even a baby Callimicos older sibling stays within the group to help raise them. Callimicos communicate with one another using about 40 different vocalizations including a shrill call to warn other members of the group of danger.