With fangs and the first sawlike teeth on Earth, the biggest predator in the swamps of the early Permian Period ate anything it wanted.
But when Dimetrodon waddled on land 290 million years ago, there weren't enough tasty herbivores to go around, according to an idea proposed in the 1970s by famed paleontologist E. C. Olson. "There were too many meat eaters," said Robert Bakker, the curator of paleontology at the Houston Museum of Natural Science. "There was a meat deficit all over the world."
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