The Horns: The nose horns are made from a hairlike substance that grows throughout the rhino's life. If the horn is broken off, it will grow back. The horns can grow from 1 to 3 inches (2.5 to 8 cm) each year. The longest-known rhino horn was over 5 feet (1.5 m) long!

Anatomy: The White Rhinoceros is up to 6 1/2 feet (2 m) tall at the shoulder and weighs roughly 5,000 pounds (2300 kg). Rhinos are perissodactyls, odd-toed ungulates (hoofed mammals), related to horses.

Diet and Behavior: Rhinos are herbivores (plant-eaters) who graze on grass as they walk. The White Rhinoceros is nocturnal, it is most active at night and during sunrise and sunset. During the hot African day, it lies in mud or dust.