Before gorillas inhabited the entire rainforest that stretched from the coast of West Africa to the western arm of the Great Rift Valley. But due to climate changes they divided into western and eastern populations. There three subspecies namely western lowland gorilla(Gorilla gorilla gorilla) in the lowland rainforests of west Africa, Eastern lowland gorillas (gorilla gorilla graueri) inhabits the forests of eastern Congo and Mountain gorillas (gorilla gorilla beringei) found in the high altitudes of Bwindi forests in Uganda and Virunga Volcanoes in Rwanda. Because of the higher altitude forests, the mountain gorillas developed longer hair, broader jaws, wider chests that distinguish them from their lowland counterparts. The Virunga, Mgahinga and Bwindi gorillas are genetically the same subspecies.