Picture of the horse specimen. (IMAGE) PLOS Caption Picture of the horse specimen. Credit Nicolas Delsol, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/) 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.