Temperature Key to Crocs in the Sea

Evolution is great at producing novelty. Every organism that has ever lived - from the first cell to the grass on your lawn and the blue whales in the sea - is a testament to that. But evolution can also repeat itself. From disparate starting points, evolution can spur some lineages to serendipitously converge on similar forms or behaviors. Among these replays - arguably among evolution's greatest hits - are no less than five varieties of marine crocodile.

None of these seabound reptiles exist today. True, saltwater crocodiles and even American alligators can be seen at sea, but they are not as tied to the ocean as the prehistoric ...

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