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?"
Answer It is made of keratin, the same substance as hair and fingernails.
http://wiki.answers.com/Q/What_is_a_Rhinoceroc_Tus...
Rhino horns are made of keratin, a substance also found in human hair and tusks.
http://www.chacha.com/question/what-are-rhino-tusk...
Tusks are used to produce ivory. They are made largely from keratin, also found in nails and hair.
http://www.kgbanswers.co.uk/what-are-tusks-made-of...
its made of hairs that are silimar to that of our nails.
http://answers.yahoo.com/question/index?qid=200908...
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