Aucasaurus was one of many mid-sized South American meat eaters, the best known of which is Carnotaurus. Aucasaurus had longer arms than Carnotaurus and no horns on it's head. It's strong jaws and teeth were it's weapons. It's legs were long and light, suggesting that it might have run down it's prey. A complete skeleton of Aucasaurus was found on top of the fossil nest of hundreds of Sauropod eggs. So Aucasaurus may have had an appetite for baby dinosaurs and eggs.