Horse skull and tooth (IMAGE) Florida Museum of Natural History Caption Nicolas Delsol was originally sequencing ancient DNA from cow teeth preserved in archaeological sites when he realized one of his specimens actually belonged to a horse. 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.