The western lowland gorilla (Gorilla gorilla gorilla) is a subspecies of the western gorilla (Gorilla gorilla) that lives in montane, primary, and secondary forests and lowland swamps in Angola, Cameroon, Central African Republic, Congo, Democratic Republic of the Congo, Equatorial Guinea and Gabon. It is the gorilla usually found in zoos. Adult male Gorillas are prone to cardiomyopathy, a degenerative heart disease.