Saimiri ustus

The body length is 20 cm to 40 cm, but the tail is up to 42 cm long, and the weight is only 750 grams to 1100 grams. They are slender, with short tails, thick and soft fur, and bright and colorful body color. The edge of the mouth and snout are black, the eye circles, ear edges, nose bridge, cheeks, throat and both sides of the neck are white, and the top of the head is gray to black. The back, forelimbs, hands and feet are red or yellow, and the abdomen is light gray. They have a pair of large eyes with wide eye spacing and a pair of large ears. The tail can be wrapped around branches.

The Mahe squirrel monkey is found in Brazil (Amazon, Mato Grosso, Pará, Rondônia). It lives in primary and secondary forests, as well as cultivated areas, and in woods from sea level to 1,500 meters above sea level, usually near streams.

The scientific name of the Mahe squirrel monkey, Saimiri ustus, is a tree-dwelling animal that occasionally moves on the ground. They are active during the day, usually in groups of 10-30, sometimes up to 100 or even more. Each group has its own territory and uses the secretions of the anal glands as boundaries. They are lively and active, usually jumping between branches. The lifespan is 10-12 years. They mainly feed on fruits, nuts, insects, bird eggs, etc.

Listed in the World Conservation Union (IUCN) ver.: 2008 Red List of Primates - Near Threatened (NT).

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