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Prehistoric Marine Reptile Fossil Found With Embryo Inside

PlesiosaurIt’s been a widely accepted fact that reptiles lay eggs. But did they always? New findings in a pleiosaurs’ fossil revealed that this marine reptile gave birth to live young. Via New Scientist:

Think less sea monsters, more doting parents: the long-necked plesiosaurs that roamed the seas during the dinosaur era gave birth to live young. They probably cared for their offspring and may even have lived in large social groups, like modern-day whales.

Plesiosaurs were reptiles, which as a group tend to lay eggs rather than giving birth. Other prehistoric marine reptiles were known to be exceptions to that rule, but until now fossil evidence that plesiosaurs did the same has been frustratingly elusive. “People have looked and looked,” says F. Robin O’Keefe of Marshall University in Huntington, West Virginia.

Last year O’Keefe was called in to help prepare a fossil plesiosaur for display in the Natural History Museum of Los Angeles County.

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