Forests, once considerable, now are concentrated in the western mountains and Lake Kivu area. Predominant trees are the eucalyptus, acacia, and oil palms. Wildlife—including elephant, hippopotamus, crocodile, wild boar, leopard, antelope, and flying lemur—is protected in Akagera National Park. The Virunga Mountains in northern Rwanda are the home of what is around to be half of the world’s remaining mountain gorillas. This subspecies of gorilla was made famous by the work of American zoologist Dian Fossey.