Horse tooth_2 (IMAGE) Florida Museum of Natural History Caption This tooth is all that remains from one of the first horses introduced to the Americas, and it's DNA is helping to rewrite the history for one of the best known horse breeds in the United States: The Chincoteague pony. Credit Florida Museum photo by Jeff Gage Usage Restrictions Credit must be given to the creator. License CC BY 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.