Labels:text | animal | mammal | mule OCR: 50 MYA HYRACOTHERIUM I TORSES EVOLVED soon after dinosaurs became extinct. Hyracotherium is believed to be a direct ancestor of today's horses. Hyracotherium had four-toed front legs and modern horses have evolved with one weight-bearing toe on each foot. ELONGATED SKULL THREE-TOED HIND LEGS SMALL PLANT-EATER FOUR-TOED Hyracotherium was only FRONT LEGS 60 cm (2 ft) long, and grazed on the newly evolving grasses.