Did You Know?
When Herrerasaurus lived, dinosaurs were actually quite rare. They had yet to become dominant creatures. The Herrerasaurus is one of the earliest big killer dinosaurs that have been found. It cannot be classNameified as either a Saurischia or Ornithischia. This early and very primitive dinosaur had four toes on its back feet. This separates it from other meat-eating dinosaurs, which had three toes.