The only animals that can kill adult rhinos are people. Poachers sell rhino horns to use in folk medicine. Rhinos are in danger of extinction because of hunting and the loss of habitat.

The Horns: The nose horn(s) are made from a hairlike substance that grows throughout the rhino's life. If the horn is broken off, it will grow back. They 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: Rhinoceros are from 3 1/2 feet to 6 1/2 (1 to 2 m) tall at the shoulder and weigh from 2,400 to 5,000 pounds (1000 to 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 and other plant material.