Dichotomous Key/Perissodactyla

1

 * Number of toes
 * One -
 * More -

3

 * Horn
 * Present -
 * Not present -

#4: Rhinocerotidae

 * Number of horns
 * One - Rhinoceros sondaicus
 * Two - Either Diceros bicornis or Dicerorhinus sumatrensis