For the last 20 million years of the Age of Dinosaurs, giant tyrannosaurs sat high on the top of the global food chain thanks to their enormous size and sharp senses.
But it wasn't always that way.
The giant carnivores that ruled the planet from 85 to 65 million years ago evolved from an ancestral...
via L.A. Times - Science http://ift.tt/21scKwg
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