Fig 1 (IMAGE) University of Bristol Caption Plantar (underneath) view of feet of a four-toed tapir (left) and a one-toed horse (right) and in the middle, a reconstruction of the extinct three-toed horse Credit Plantar (underneath) view of feet of a four-toed tapir (left) and a one-toed horse (right) by Nuria Melisa Morales-García, in the middle, a reconstruction of the extinct three-toed horse Hipparion, by Karolina Suchan-Okulska Usage Restrictions Once with release License Original 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.