The Javan rhinoceros (Rhinoceros sondaicus), also known as the Sunda rhinoceros or lesser one-horned rhinoceros, is a very rare member of the family Rhinocerotidae and one of five extant rhinoceroses. It belongs to the same genus as the Indian rhinoceros, and has similar mosaic, armour-like skin, but at 3. 1–3. 2 m (10–10 ft) in length and 1. 4–1. 7 m (4. 6–5. 6 ft) in height, it is smaller (closer in size to the black rhinoceros of the genus Diceros). Its horn is usually shorter than 25 cm (9. 8 in), and is smaller than those of the other rhino species. Only adult males have horns; females lack them altogether.