- Animals with Odd-Numbered Hooves - Information, photos and videos of horses, zebra, rhinoceros and other odd-toed ungulates.
www.thebigzoo.com/zoo/Perissodactyla.asp
- Ultimate Ungulate Page: Perissodactyla - Taxonomy of the order of horses, zebras, tapirs and rhinoceroses, with biological descriptions of many individual species.
www.ultimateungulate.com/perissodactyla.html
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