As detailed in a new research paper published last week in the Journal of Vertebrate Paleontology, the coarse-looking beast grew to roughly 16.4 feet in length, sported long claws, delivered a vicious bite courtesy of razor-sharp teeth, and possessed a powerful sense of smell. Its most distinguishing ability points to an acute sense of hearing, possibly far greater than the majority of prehistoric beasts of the time. Its large blunt skull was formed by thick bones, bulges, horns, and sharp ridges, similar in many ways to today's reptiles like the Gila Monster or iguanas. Credit: Dr. Federico A. Gianechini et al./Journal of Vertebrate Paleontology