A fossil skull from a site called Gawis in Ethiopia is apparently intermediate in form between Homo erectus and our own species, Homo sapiens. Nearby, in the same stratigraphic level from which the skull came, scientists found stone tools made in the Late Acheulean tradition and fossils representing pigs, zebras, elephants and cats, among other species. The find hails from the Middle Pleistocene, a relatively poorly represented time period as far as human fossils go. The discovery team, led by Sileshi Semaw of Indiana University, is working to determine the age of the skull more precisely.