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Horses have been in Florida for approximately 25 million years, but Equus (the modern horse) has been here for about 2 million. The Pleistocene example here had an appearance very similar to the modern horse, although often slightly smaller. Its remains are very common in Florida rivers and streams. If the chewing surface of the horse tooth is approximately square, it is an upper tooth. If rectangular, it is a lower. This is true with many plant chewing animals, such as elephants, rhinos, tapirs, titanotheres, etc.