Until now, researchers had thought that the fearsome marine reptile known as Dinocephalosaurus laid eggs, just as birds and crocodiles (its distant relatives) do. "This is the first-ever evidence of live birth in an animal group previously thought to lay eggs exclusively," said the study's lead researcher, Jun Liu, an associate professor of paleontology at the Hefei University of Technology in China. Researchers discovered the specimen of the pregnant Dinocephalosaurus in southwestern China's Luoping Biota National Geopark in 2008.
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