The end of the rhino

by Greg Mayer The five living species of rhino, along with the several species of tapir and horse (which include the zebras and asses), are members of the great mammalian order of odd-toed ungulates, or Perissodactyla. Perissodactyls were formerly much more species rich; today, most ungulates (hoofed mammals) are even-toed, members of the Artiodactyla, which […]