Rhino Dies During Procedure to Deter Poachers South African conservationists say their attempt to protect a rhinoceros from poachers ended with the animal's death. Lorinda Hern, spokeswoman for a private reserve near the capital, Pretoria, said the 22-year-old male could not be revived after being sedated Thursday so his horn could be treated with a dye and an insecticide. He died in front of journalists who had been invited to learn more about anti-poaching efforts. Hern says the reserve began treating horns to make them unattractive to poachers after losing a pregnant rhino and her calf to poachers in 2010. She says Thursday's death was the first among up to 20 rhinos that have undergone the procedure. Hern says an autopsy is under way to determine the cause of death. She says the dyeing will continue.