wat r Artiodactyla & perissodactyla ? as they don't have gall bladder in them.
Among the class Mammalia, ungulates are a superorder consisting of hoofed animals. Artiodactyla and Perissodactyla are two orders belonging to the superorder Ungulata. Artiodactyls are animals that have even number of toes while perissodactyls have odd numbered toes. Camels, cows, goats, pigs etc are examples of artiodactyls and horses, tapirs, rhinoceros, donkeys and zebras are perissodactyls.
Hope it is clear to you now,