By the Oligocene Epoch some horses were becoming larger,
able to run swiftly through open woodlands. There were no
wide-open grassy plains as yet - grasses were only just
beginning to evolve. Miohippuslived from 30 to less than
25 million years ago and had three toes per foot, all of
which touched the ground. However, the middle toe was
larger than the other two and bore most of the weight .
Miohippuswas about the size of today's sheep, standing some
60cml24in at the shoulder, and had a
longer, dished snout, . alonger neck and longer legsthat earlier horses. It lived at the Same time as another horse genus,
Mesohippus, with probably the former giving rise to
further, larger types of horses.