The fossil discovery, described in the Journal of Vertebrate Paleontology, introduces a new species named Llukalkan aliocranianus. This dinosaur lived about 80 million years ago and was part of the powerful group of carnivores known as abelisaurids. Scientists believe this predator was not only fearsome in appearance, but may also have produced a deep, resonant roar that set it apart from its relatives. Credit: Jorge Blanco/Journal of Vertebrate PaleontologyWhat Makes Llukalkan Stand OutAbelisaurids are often compared to Tyrannosaurus rex because of their stocky bodies, short arms, and formidable bite. The discovery of Llukalkan opens new questions about how sound influenced dinosaur behavior.