These are largest primates in the world with the male silverbacks being twice the size of the female gorilla. There are two species of gorillas found in Africa. One species are found in the volcanic mountains of Virunga in Central Africa and the Democratic Republic of Congo. The other mountain gorilla species is found in the Uganda Bwindi Impenetrable forest. Gorillas are listed as the critically endangered species, due to human encroachment and illegal poaching.