<i>Doedicurus clavicaudatus</i> (IMAGE) American Museum of Natural History Caption This illustration shows two male glyptodonts (Doedicurus clavicaudatus) facing off: The massive, club-shaped tails were probably used more for intraspecific combat than defense against predators. Credit © Peter Schouten Usage Restrictions Can be used with appropriate credit 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.