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Macintosh Picture Format  |  1996-09-10  |  166.6 KB  |  640x310  |  8-bit (162 colors)
   ocr: later leaf-eating horses, like Mesohippus, which lived about thirty million years ago, had larg- er teeth with broader surfaces for chewing. Over the next twenty to thirty million years, many horses adapted to life in the new grasslands. Merychippus, which lived about fifteen million years ago, may have been one of the first to do SO. It had taller, more firmly anchored teeth for grazing and grinding up grass, which is much tougher than leaves. Fully grazing horses like Equus, which evolved about four million years ago, have even taller teeth, with very high crowns. 1. Hyracothe- 17 rium vasac ...