For 150 million years during the age of the dinosaurs, a group of dolphin-like reptiles called ichthyosaurs ruled the ocean – until everything started to go wrong.
After multiplying into about 100 known species, ichthyosaurs began to disappear from the oceans around the middle of the Cretaceous...
via L.A. Times - Science http://ift.tt/1XjaIxn
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