A rhino's horn never stops growing! Besides being well known for their big horns and tanklike bodies, rhinos possess many other unique traits that make them special. Did you know that a rhino's horn is made out of the same substance that makes up hair and fingernails? Or that rhinos are nearsighted? And rhinos use infrasound to communicate with each other! Read fifty fun facts about rhinos that make these magnificent creatures worth saving from extinction and how you can help.