Although Tyrannosaurus rex liked to dig its teeth into flesh, many of its relatives had beaks, fewer teeth and longer necks and preferred plants, according to a new study.

Scientists at the Field Museum in Chicago report their findings on theropod dinosaurs in the Proceedings of the National Academy of Sciences.

“Our image of theropods as flesh eaters is antiquated and outdated,” said Lindsay Zanno, a paleontologist at the museum and the study’s lead author. “Even we colloquially called them predatory dinosaurs.”