Ira talks with Michael Novacek, author of Terra, paleontologist and curator at the American Museum of Natural History in New York, about a new fossil discovery. Researchers excavated a 100 million-year-old skull of a Nigersaurus and found it had a very unusual set of teeth. Range of motion image courtesy of Dr. Kent Stevens, University of Oregon (http://www.cs.uoregon.edu/~kent/).
Produced by Flora Lichtman. Images courtesy of Project Exploration, © 2007 National Geographic. Compsite motion image © Kent Stevens.