TORONTO, Feb. 7 (UPI) -- The first top carnivore predator to walk on land developed "steak-knife" teeth allowing it to eat prey much larger than itself, Canadian scientists say.
Dimetrodon, a dinosaur carnivore that lived 298 million to 272 million years ago, was the first terrestrial vertebrate to develop what are called ziphodont teeth, serrated like a steak knife, researchers at the University of Toronto reported Friday.