Sea snakes are the most diverse group of marine reptiles in the world, but they are poorly understood and threatened by development. Blanche D'Anastasi is among the scientists working to save them.

Six to 8 million years ago, a snake related to swamp snakes or tiger snakes slithered into the sea. Over evolutionary time, descendants of that snake developed flattened paddle tails, an ability to breathe through the skin and a valve to stop water from entering the lungs. Today these creatures live their entire lives in the water. Clad in spots, triangles and stripes, they undulate across coral reefs

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