Gorillas are very old in their evolution, and they separated millions of years ago from other great apes. Africa is dominated by two distinct species, which are the western gorilla (Gorilla gorilla) and the eastern gorilla (Gorilla beringei). The eastern gorilla further divides into the mountain gorilla located in the Virunga mountains and the Bwindi Impenetrable Forest and the lowland gorilla located in the Congo Basin.
These apes inhabit groups or troops, ruled by one dominant silverback male that defends the group, arbitrates disputes, and takes them on feeding expeditions. Gorillas are complicated in their ways of communication: they are able to communicate using vocalizations, gestures, and expressions. As opposed to the myth, gorillas are primarily herbivorous and peaceful, subsisting on leaves, stems, fruits, and at times bark.
Male adults weigh 300 to 500 pounds, and females are smaller in weight, ranging from 150 to 250 pounds. Gorillas are a reflection of human behavior because of their smartness, social relationships, and their capability to use basic tools. To see gorillas in their natural habitat, which is safe in zoos and sanctuaries, it is necessary to maintain a respectable distance and follow the instructions of an expert.