Eastern gorilla
There are two recognised subspecies of eastern gorilla: the mountain gorilla ("Gorilla beringei beringei") of the volcanic slopes of Rwanda, Uganda and eastern Democratic Republic of Congo; and Grauer's gorilla or eastern lowland gorilla ("Gorilla beringei graueri") in eastern Democratic Republic of Congo.
Orangutan
The three orangutan species are the only extant members of the subfamily Ponginae. This subfamily also included the extinct genera "Lufengpithecus", which lived in southern China and Thailand 2–8 mya, and "Sivapithecus", which lived India and Pakistan from 12.5 mya until 8.5 mya. These apes likely lived in drier and cooler environments than orangutans do today. "Khoratpithecus piriyai", which lived in Thailand 5–7 mya, is believed to have been the closest known relative of the orangutans. The largest known primate, "Gigantopithecus", was also a member of Ponginae and lived in China, India and Vietnam from 5 mya to 100,000 years ago.