A large standard concentration of wild animals can be found in the huge and perfect crater of Ngorongoro. Nearby, the crater of Empakaai, filled by a deep lake, and the active volcano of Oldonyo Lenga can be seen. Excavations carried out in the Olduvai Gorge, not far from there, have resulted in the discovery of one of our more distant ancestors, Homo habilis. Laitoli Site, which also lies within the area, is one of the main localities of early hominid footprints, dating back 3.6 million years.