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T. rex Evolution: Smarts First, Size Second

Big brains, little arms.

RELATED TAGS: PALEONTOLOGY
trex
“How does evolution make such a spectacular animal like T. rex?” marvels University of Edinburgh paleontologist Stephen Brusatte. It’s a long-running question that, in March, he helped answer. We’ve known that T. rex and other giant tyrannosaurids, such as Tarbosaurus, evolved about 80 million years ago from much earlier, much smaller dinosaurs. The big mystery was the crucial transition between a primitive little fella trying to survive and a highly evolved apex pre...
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