Eastern gorilla
The eastern gorilla ("Gorilla beringei") is a critically endangered species of the genus "Gorilla" and the largest living primate. At present, the species is subdivided into two subspecies. Grauer's gorilla, formerly known as the eastern lowland gorilla ("G. b. graueri") is more populous, at about 3,800 individuals. The mountain gorilla ("G. b. beringei") has only about 1000 individuals. The International Union for the Conservation of Nature mentioned illegal hunting in its assessment of threats to the species.
Metro Richmond Zoo
The zoo has one of the largest collections of primates in the United States, with more than 200 individuals representing 30 species, such as Sulawesi macaque, Diana monkey, orangutan, cottontop tamarin, red-handed tamarin, black-handed spider monkey, lesser spot-nosed monkey, coppery titi, eastern black-and-white colobus, ring-tailed lemur, red ruffed lemur, and black-and-white ruffed lemur . The zoo has a Diana monkey breeding program.