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?"
Elephant tusks are made from Ivory and it is a very valuable material .
http://wiki.answers.com/Q/What+were+tusks+made+for
Elephant tusks are actually a pair of elongated teeth, and are made of ivory!
http://www.chacha.com/question/what-is-elephant-tu...
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...
Rhino horn is actually not horn but tightly matted hair packed with keratin, much like human fingernails or hair
http://www.kgbanswers.co.uk/what-is-a-rhino-horn-m...
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