br Get ready for a stampede of little-known facts about the rhinoceros, from weird biological traits to its interactions with human beings over the years.br br 1. A charging rhino reaches speeds over 30 mph and can scatter a herd of elephants.br br 2. Rhino horns are not made of bone, but of keratin, the main ingredient in human hair and fingernails. Rhino horns are similar to horse hooves and turtle beaks.br br 3. Adult rhinoceroses have no natural predators except for human beings.br br 4. “Oxpicker” birds often ride on the backs of rhinoceroses, picking bugs from the rhino’s skin and warning it of possible threats.br br 5. The black rhino population in Africa is down 97.6 since 1960 due to over-hunting and horn poaching.br br 6. Lions will break off a hunt in order to avoid crossing a black rhino's path.br br 7. The ancestors of today’s rhinos, “woolly rhinoceroses,” roamed the Earth as recently as 10,000 years ago.br br 8. Rhinos are generally solitary, but they sometimes form groups. A group of rhinos is called a "crash."br br 9. Rhinos very rarely attack human beings, though they sometimes ram cars driving through their habitat. When provoked, they are brutal opponents.br br 10. Male black rhinos are very aggressive towards other males and engage in mighty battles with teeth and horns. Up to 50 of males die from such fights.br br Check out more interesting rhino facts here: br FactRetriever is a leading producer of the most interesting facts, online video content, and a plethora of fascinating topics.