Rise of crocodiles stemmed from mass extinction, study says

03/26/2013 | LiveScience.com

The extinction of nearly half the Earth's species 201 million years ago may have given rise to an ancestor of the crocodile, according to a study published in the journal Biology Letters. Researchers say volcanic activity or a large meteor between the Triassic and Jurassic eras killed off nearly all archosaurs that were crocodile-like, known as pseudosuchia. The only one that survived was the crocodylomorph -- the ancestor to today's crocodiles and alligators.

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