Many types of mammals eat plants, from tiny voles and mice to huge elephants. The main group of large
herbivores is the ungulates, or hoofed mammals. Their toe-tips evolved from claws into hard hooves, and
most have become alert, swift browsers or grazers. The perissodactyls- odd-toed ungulates, with an odd
number of toes per foot - include the equids, which are horses and zebras, and also rhinos and tapirs.