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?"
It is made of keratin, the same substance as hair and fingernails.
http://wiki.answers.com/Q/What_is_rhino_tusk_made_...
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...
Unlike other horned animals, which have a bony core encased in keratin, rhinos have only mineral deposits of calcium and melanin at the core of their horns, more akin to hooves and
http://www.ehow.com/facts_7499547_horn-rhino-made....
Rhino hairs are made out of a protein called "keratin". It is also the same component that makes up rhino horns.
http://www.kgbanswers.com/what-are-rhino-hairs-mad...
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