Gorgonopsian (IMAGE) Harvard University Caption Gorgonopsian were the first saber-toothed animals. Their canines extended up to 13 centimeters. Credit CCA 3.0/Dmitry Dogdanov Usage Restrictions CC-by 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.