The Leontocebus Rosalia, also known as the golden lion tamarin, is a species of monkey found in the Atlantic Forest in Brazil. This unique primate has distinctive bright orange-red fur and a mane-like crest around its head, giving it a regal appearance. There are a few different synonyms used to refer to this species including the marmoset monkey, the golden lion marmoset, and the red lion tamarin. Although it is a small monkey, it is known for its agile movements and excellent climbing abilities. Despite being considered critically endangered, conservation efforts have worked to stabilize the population of these beautiful creatures in their natural habitat.