Contains 24 papers covering virtually every recent development regarding fossil horses, rhinos, tapirs, and their extinct relatives - the perissodactyls or odd-toed hoofed mammals. Includes much material not previously published, and tries to resolve some contentious issues, such as whether hyraxes are related to elephants or not. The summary chapter includes charts which show the relationships of all perissodactyl genera, their distribution in time and space, and a new classification of the order.