Horses first evolved in North America. Some of their early ancestors lived 30–40 million years ago and were small, three-toed browsers that fed on leaves of woody plants. By the last Ice Age, large ...

Prey in the ice age was plentiful; horses, deer, and camels roamed the land in great numbers. When a giant fossilized claw was discovered in West Virginia in the late 1700s, there was great ...