Callithrix jacchus

The common marmoset is 19-25 cm long, with a tail length of 27-35 cm. The female weighs 260-350 grams, and the male weighs about 450 grams. The average lifespan is 10 years. The main features are claws, fur on the wrists, no wisdom teeth, a relatively primitive brain, and unstable body temperature. The fur is gray. There is a tuft of long white hair next to the ear, so it is also called the velvety-eared marmoset. There is a large white mark on the forehead, the face is hairless, the body is mottled gray-brown, and there are gray, orange or black thin stripes on the back. The tail is gray with a ring of white rings.
These little monkeys are "tan" and the skin on their faces changes color in the sun.
The snout is shortened, the face is bare and hairless, and the contours are clear. The eye sockets are formed into a ring by the bones, which makes the eyes look forward, and the distance between the eyes is narrow. The vision is developed and three-dimensional, which can ac

Distribution in Brazil (Alagoas, Bahia - introduced, Ceará, Espirito Santo - introduced, Maranhão, Paraíba, Paraná - introduced, Pernambuco, Piauí, Rio de Janeiro - introduced, Rio Grande do Norte, Santa Catarina - introduced, Sao Paulo - introduced, Sergipe - introduced).
Common marmosets are found in forests in northern and central Brazil. They prefer secondary and primary forests, as well as forest edges as habitats, although they also occur in other forest types such as savanna forests, riverine forests, coastal forests and inland forests.

Common Marmoset (scientific name: Callithrix jacchus) is called Common Marmoset in English. There are 2 subspecies.

Common Marmoset is active during the day, mainly climbing and jumping on trees, and sometimes appears on flat ground. They form groups of 4-15 individuals, usually a family. Groups are stable, with several dominant individuals in each group that can reproduce. The remaining non-breeding individuals are of different ages, regardless of gender. Adult females can stay in the family, while males must move out of the group when they reach adulthood. The activity area is 300,000 square meters. There is a strict hierarchy in the group. Common marmosets use staring, squinting, mouthing, vocalization and smell to communicate, express emotions and convey alarms. These marmosets will flatten their ear feathers to express fear.

The diet of common marmosets is diverse, mainly feeding on insects, spiders, small vertebrates, bird eggs, fruits, lizards, small birds or tree exudates.

The gestation period of the common marmoset is about 1143-153 days, and each litter produces 1-3 pups, usually twins. Females reproduce once every two years, and the pups do not have the characteristic white ear feathers at birth. The weight of the common marmoset is about 20%-27% of the adult, and the weight of the newborn is 25-35 grams. After 40-120 days of feeding, the weight is 60-150 grams at weaning. The pups reach adult weight at 15 months of age and reach sexual maturity at 18-24 months.

Listed in the 2008 Red List of Endangered Species of the World Conservation Union (IUCN) ver3.1 - Low Risk (LC).

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