The Javan and Indian rhinoceroses have only one horn, whereas the other three species have two.

Black rhinos are so called because of the dark mud they wallow in. English colonists misinterpreted this as white. In the Afrikaans language, white rhinos were called wyd, which means wide, and described the animal's mouth. Black and white rhinos are not actually named for their colors, as both are gray.Rhinos wallow in the mud to coat their skin for protection. Rhinoceros skin is incredibly thick and tough, but it is also sensitive to sunburn and insect bites.

Baby rhinos weigh between 90 and 140 pounds at birth.

He may be cute, but this baby probably weighs as much as a light-weight, fully-grown man

Rhinos are usually solitary creatures, though some travel in herds called 'crashes.'.

Traditional Chinese medicine holds that the horns possess healing properties, they have been used as an aphrodisiac, and in Yemen they are prized as dagger hilts.

Rhino horns are highly coveted and are valued more than gold in some parts of the world.

These prehistoric beasts stood 16 feet tall at the shoulder and weighed 20 tons.

The largest rhinoceros species that ever lived was Paraceratherium.

Rhinos live an average of 35 to 40 years.

Rhino horns are structurally similar to horse hooves and turtle beaks.

Rhino horns are not made of bone, but of keratin-the main ingredient in human hair and fingernails-combined with calcium and melanin.

The southern white rhino eats a staggering 120 pounds of grass every day.

All rhinos are herbivorous, meaning they only eat plants.Black, Javan, and Sumatran rhinos are all critically endangered species.Conservation efforts raised that number to around 5,000 by 2017. By 1988, hunters and poachers had reduced that number to 2,500. During the 1960s, approximately 60,000 black rhinos lived in Africa.They can grow to over 7,700 pounds (3500 kg) and reach a length of 13 feet (4 meters). The white rhino is the second-largest land animal on the planet, after the elephant.Occasionally rhinos will ram vehicles, attempting to make them leave, which can cause tremendous damage. Rhino attacks on humans are incredibly rare.

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