Which order is associated with odd number of toes?

• A. Artiodactyla
• B. Carnivora
• C. Ungulata
• D. Perissodactyla

Answer: (D)

The idea here is recognizing how hoofed mammals are categorized by the number of toes that bear weight. Perissodactyla are known as odd-toed ungulates, meaning they bear weight on an odd number of toes per foot. This group includes animals like horses and rhinoceroses, which illustrates the trait. In contrast, Artiodactyla are even-toed ungulates, with weight borne on two or four toes, such as cows, sheep, and pigs. Ungulata isn’t a single strict order, but a broader grouping of hoofed mammals that spans both odd- and even-toed kinds, so it doesn’t specify toe count. Therefore, the order associated with an odd number of toes is Perissodactyla.