"The rhino is prized for its horn. The horns of a rhinoceros are made of keratin, the same type of protein that makes up hair and fingernails in most animals including humans. Both African species of rhino and the Sumatran rhinoceros have two horns, while the Indian rhino and Javan rhinoceros have just one horn." http://www.patreon.com/raocow https://talkhaus.raocow.com/viewtopic.php?f=3&t=17447