The Black-mantled Tamarin is a species of tamarin from the northwestern Amazon in far western Brazil, southeastern Colombia and northeastern Peru where they mainly eats insects, leaves, and fruit. They are 15–28 cm in length and their tail length is 27–42 cm. Family groups consisting of a male, a female and 1 or 2 young live in a defined territory - the female marks branches on the boundaries of the territory with secretions of her anal glands and urine. The female gives birth to 2 young after a gestation of 140 to 150 days. They are listed as Least Concern due to its adaptability to disturbed habitats, presumed large populations, and occurrence in a number of protected areas. It is not believed to be declining at a rate sufficient to qualify for a threatened category. Although they were captured for export for biomedical research in the 60s and 70s, they are still common.