The Madeleine Brand Show for August 12, 2011

Pregnant “Polly,” the pre-historic plesiosaur, at the L.A. Natural History Museum

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LA Natural History Museum

Polly the plesiosaur and her baby. This fossil is on display at the Natural History Museum in Los Angeles.

The pre-historic plesiosaur: it looked like the quintessential sea monster. It had a long neck, flippers and fangs. Think of the Loch Ness monster, and you are on the right track. But a paper published today in the journal "Science" says these ancient beasts may have actually been social creatures and doting mothers. The research is based on a fossil of a pregnant plesiosaur that's part of the new dinosaur exhibit at the Los Angeles Natural History Museum. Reporter Sanden Totten paid the specimen a visit.

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