John Moretti 1 (IMAGE) University of Texas at Austin Caption Jackson School of Geosciences doctoral student John Moretti holds a skull of the saber-toothed cat Homotherium that is part of the Jackson School’s Vertebrate Paleontology Collections. Credit Jackson School of Geosciences Usage Restrictions Credit image License Original 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.