Gomphothere Mandible (IMAGE) University of Arizona Caption Archaeologists working in northwestern Mexico were not sure what kind of animal they had unearthed until they found this telltale jawbone, which belonged to a gomphothere. Credit Joaquin Arroyo-Cabrales/Instituto Nacional de Antropología e Historia Usage Restrictions Joaquin Arroyo-Cabrales/Instituto Nacional de Antropología e Historia License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.