The secret is out: Man and gomphotheres once coexisted in Sonora. Tools and spear tips found with fossil bones at a remote Sonoran site suggest that Clovis-era hunters butchered two juvenile specimens of the elephantlike megafauna about 13,000 years ago. It's the first discovery of such recent evidence of gomphotheres in North America, said Vance Holliday, a University of Arizona anthropologist. It's also the first time gomphothere fossils were found together with implements made by Clovis people, the oldest known inhabitants of North America, Holliday said. The discovery, on a remote ranch in the Rio Sonora watershed, was actually made...