This tamarin is part of a captive but free-ranging population – they roam freely in a wooded area inside the grounds of the Philadelphia zoo, but all have radio collars to monitor whether they might leave. Because they are very territorial, so far none have left the area. (They are brought into the Small Mammal house for the winter months.)
The Golden Lion Tamarin (Leontopithecus rosalia, Portuguese: Mico-leão Dourado) also known as Golden Marmoset, is a small New World monkey of the family Cebidae. Native to the Atlantic coastal forests of Brazil, the Golden Lion Tamarin is an endangered species and among the rarest animals in the world, with an estimated wild population of “no more than 1,000 individuals” and a captive population maintained at approximately 490 individuals.