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rhinoceros, (family Rhinocerotidae), any of five or six species of giant horn-bearing herbivores that include some of the largest living land mammals. Only African and Asian elephants are taller at the shoulder than the two largest rhinoceros species—the white, or square-lipped, rhinoceros (Ceratotherium simum), which some divide into two species (northern white rhinoceros [C. cottoni] and southern white rhinoceros [C. simum]), and the Indian, or greater one-horned, rhinoceros (Rhinoceros unicornis). The white rhinoceros and the...