Eohippus, (genus Hyracotherium), also called dawn horse, extinct group of mammals that were the first known horses. They flourished in North America and Europe during the early part of the Eocene Epoch (56 million to 33.9 million years ago).Horses can't breathe through their mouth. ...Horses can sleep standing up. ...Horses have lightning fast reflexes. ...Horses have 10 different muscles in their ears. ...Horses have a nearly 360 degree field of vision
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