The rhinoceros is under threat yet againCONTRARY to widespread belief in China and South-East Asia, the rhinoceros horn has no proven medicinal or aphrodisiac qualities. Its effect, some scientists say, is the same as chewing your fingernails. It is made of the same stuff, agglutinated hair. Yet rhino horn is currently worth more than gold, selling for up to $60,000 a kilo.