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Last updated on April 23, 2014 at 17:36 EDT

Were Dinosaurs Undergoing Long-Term Decline?

May 3, 2012

Were dinosaurs already undergoing a long-term decline before an asteroid hit at the end of the Cretaceous about 65.5 million years ago? A new study led by scientists at the American Museum of Natural History gives a multifaceted answer.  credit:  American Museum of Natural History