Rhinos are extremely vulnerable to poaching due to the high value of their horns.
Even though the horns are made of keratin and have no known medicinal properties, some people think the horns cure ailments such as hangovers and cancer.
The elderly southern white rhino's death has been called "profoundly sad." There are about 18,000 in the wild.
Bandhu, a 12-year-old one-horned rhino, is known for his unique talents. At his recent birthday party, he showed them off by playing himself a little birthday tune on a keyboard.
Official estimates suggest that there are fewer than 80 of these rhinos left in the wild.
The Kenyan official made the statement during Sudan's, the world's last male northern white rhino, funeral on Saturday.
Johannesburg breeder John Hume says that making rhino horn more easily available will deter poachers from killing the rare animals.
The largest study of Javan rhinos suggests these beasts are hovering on the edge of extinction.
An international ban on trading rhino horn remains in place.
But experts worry legal schemes can't overcome poaching and illegal profits.
It doesn't exactly match historical description of unicorns, however.
The Cincinnati Zoo is just awaiting final approval from U.S. Fish and Wildlife.
Rhinos were declared extinct in Zambia in 1998, ravaged by poachers. Today they are back and living in the wild once again.