Highly Magnified View of Hadrosaur Tooth (image) University of Leicester Caption This is a highly magnified Scanning Electron Microscope view of the surface of one of the hadrosaur teeth, showing the scratches created about 67 million years ago by tooth movements and feeding. The small black boxes show the areas, each less than half a millimeter wide, in which scratches were analyzed. Credit Vince Williams, University of Leicester Usage Restrictions Must be used with credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.