Jaw of Triceratops (IMAGE) PeerJ Caption This is a tooth of a ceratopsid horned dinosaur from Mississippi, held next to a left lower jaw half of Triceratops from Montana. Credit Photo by Jeremy Copley, MDWFP Museum of Natural Science Usage Restrictions None License Licensed content 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.