What are a rhino's tusks made of?

Answer

A rhino's horn is made up of keratin and calcium. Elephants are the only other tropical animals that have tusks. A rhino's horn can grow to up to 45cm.
Q&A Related to "What are a rhino's tusks made of?"
Rhinoceros horn isn't really a horn at all, it's made up of tightly compressed hair.
http://www.chacha.com/question/what-is-a-rhino's-t...
Ivory The elephants Tusk is nothing but a form of Teeth. It is made up of calcium.
http://wiki.answers.com/Q/What_are_hippos_tusks_ma...
Elephant tusks are enlarged incisor teeth made of ivory. Both sexes of African elephants have tusks!
http://www.kgbanswers.com/what-are-elephant-tusks-...
its made of hairs that are silimar to that of our nails.
http://answers.yahoo.com/question/index?qid=200908...
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