Common Marmoset

Citron Crested Cockatoo

Scientific Name: Callithrix jacchus
Wild Status: Least Concern

About Me:

South America

The common marmoset is a New World monkey. It originally lived on the Northeastern coast of Brazil, in the states of Piaui, Paraiba, Ceará, Rio Grande do Norte, Pernambuco, Alagoas and Bahia. Through release (both intentional and unintentional) of captive individuals, it has expanded its range since the 1920s to Southeast Brazil (its first sighting in the wild for Rio de Janeiro was in 1929) and became an invasive species, raising concerns about genetic pollution of similar species such as the buffy-tufted marmoset (Callithrix aurita) and predation upon bird nestlings and eggs.

Common marmosets are very small monkeys. Males and females are of similar size with males being slightly larger. Males have an average height of 188 mm (7.40 in) and females have an average height of 185 mm (7.28 in). Males weigh 256 g (9.03 oz) on average and females weigh 236 g (8.32 oz.) on average.
Marmosets have an arboreal locomotion similar to squirrels. They cling to tree vertically, run across branches quadrupedally and leap between trees.

Social organization:
Common marmosets live in stable extended families with a few breeding individuals and a flexible mating system. A marmoset group can contain as many as 15 members, but a more typical number is nine. A marmoset family usually contains a 1-2 breeding females, a breeding male, their offspring and their adult relatives, be it their parents or siblings. The females in a group tend to be closely related and males less so. Males do not mate with breeding females that they are related to. Marmosets may leave their natal groups when they become adults, in contrast to other primate species who leave at adolescence.

Threats to Marmosets:
The main threat to this species survival is through loss of habitat. The pet trade is also considered a threat to its long term survival.