What is a rhino horn made of?

It's made of keratin-that's the stuff your hair and nails are made of.

It is not attached to the skull and is not bone.

Although the horn is made from the same substance as hair, the horn itselff is not composed of hair as previously thought.

The horn of the rhinoceros is a dermal one, meaning made from something much like skin. Skin is composed of collagen and elastic fibres. The fibre making up the rhino's horn is a keratin very similar to that making up human hair and chicken's claws.

A rhino's horn is made of keratin. Keratin also makes fingernails, hair, and claws!

Matted/compressed hair Additional Information: The Rhino horns are made up of a fibrous protein material called "keratin". It is a non-mineralized material found on many living mammals, reptiles, birds, and amphibians. The "keratin" that makes up the Rhino horn, is the same material that makes up claws, hooves, nails, and hair. The harder form is usually found in the reptiles, claws, shells, scales, and the birds, beaks, claws, and even feathers. For more details, and examples please see sites listed below.
The horn is made of compressed keratin fibers, the same material that is found in fingernails and hair. ( The Wild Ones animal Index) For the source and more detailed information concerning your request, click on the related links section (Answers.com) indicated at the bottom of this answer box.

hardened keratin.your hair and nails are made up of this protein called keratin

Rhino's horn are made of hair