Lowland gorillas live in dense forests and lowland swamps and marshes as low as sea level, with western lowland gorillas living in Central West African countries and eastern lowland gorillas living in the Democratic Republic of the Congo near its border with Rwanda. The mountain gorilla inhabits the Albertine Rift montane cloud forests of the Virunga Volcanoes, ranging in altitude from 2,200 to 4,300 metres (7,200 to 14,100 ft). Although their range covers a small percentage of Sub-Saharan Africa, gorillas cover a wide range of elevations. Gorillas' natural habitats cover tropical or subtropical forest in Sub-Saharan Africa. Gorillas tend to live 35–40 years in the wild. The Eastern gorilla is distinguished from the Western by darker fur colour and some other minor morphological differences. They tend to live in troops, with the leader being called a silverback. Gorillas are the largest living primates, reaching heights between 1.25 and 1.8 metres, weights between 100 and 270 kg, and arm spans up to 2.6 metres, depending on species and sex.

The DNA of gorillas is highly similar to that of humans, from 95 to 99% depending on what is included, and they are the next closest living relatives to humans after chimpanzees and bonobos. The genus Gorilla is divided into two species: the eastern gorilla and the western gorilla, and either four or five subspecies. Gorillas are herbivorous, predominantly ground-dwelling great apes that inhabit the tropical forests of equatorial Africa.

Angry gorilla walk