Wahala Facts: 16 most expensive materials on earth

11. The rhinoceros is a knee-less, odd-toed ungulate which is found in
Africa or Asia. They are herbivores. Rhinoceros are killed by humans
for
their horns, which are bought and
sold on the black market, and which
are used by some cultures for
ornamental or
medicinal purposes. The horns are made of keratin, the same type of
protein that makes up hair and fingernails. A gram of rhino horn goes
for $110