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This undated image provided by the journal Science shows a life reconstruction of the plesiosaur Polycotylus latippinus giving birth to a single, large young, based on fossil evidence from the Upper Cretaceous (80 million years ago) of Kansas. The giant reptile was pregnant when she died more than 70 million years ago, according to a new analysis of the remains that offers the first proof that Plesiosaur gave birth to live young rather than laying eggs.

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