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Macintosh Picture Format  |  1996-09-10  |  166.5 KB  |  640x310  |  8-bit (162 colors)
   ocr: America to Europe, Asia, Africa, and South America. About ten thousand years ago, these horses became extinct in the Americas, only to return with the Spanish conquistadors four hundred years ago. You can learn a lot about a fossil horse from its teeth. This is because teeth tell the story of the changes in horses' diets as North America changed from a place of tropical forests to one of open grasslands. The earliest horses, like Hyracotherum, which lived about fifty million years ago, were small forest dwellers that probably browsed 17 on leaves and fruit. Their teeth were small and had low c ...