Golden Lion Tamarin

The golden lion tamarin (Leontopithecus rosalia) is a small New World primate native to the Atlantic Forest of southeastern Brazil, recognized by its striking amber-orange fur and the lion-like mane that frames its face. Adults typically weigh between 400 and 800 grams and live in family groups of two to eight individuals, communicating through a repertoire of calls, scent markings, and facial expressions. They are omnivores, feeding on fruit, insects, small lizards, and nectar, and their fruit consumption and subsequent seed dispersal make them meaningful contributors to forest regeneration in a biome that has lost more than 85 percent of its original cover, according to WWF.

The species is listed as Endangered on the IUCN Red List, with the wild population estimated at around 3,700 individuals as of recent assessments, almost all confined to the state of Rio de Janeiro. Habitat loss driven by agriculture, livestock ranching, and urban expansion remains the primary threat, compounded by the fragmentation of remaining forest patches into isolated islands that limit genetic exchange between groups. Yellow fever outbreaks have also caused significant localized mortality in recent years, adding disease pressure to a population that was already recovering slowly from near-extinction in the 1970s, when fewer than 200 individuals were believed to survive in the wild.