“The vast majority of what we found in its stomach was fern leaves, along with a few stems and twigs,” said Dr. David Greenwood in a release from Brandon University.

University of Alberta scientists studied scratches left by struggling prey on the teeth of three different raptors and read them like grooves on a record to determine how the dinosaurs tore into lunch.

Researchers said earlier theories that proto-dinosaurs stood on two legs just so they could use their forelimbs to catch prey don't stand up.