A leading conservationist in South Africa, charged with smuggling rhino horns worth $14 million, has insisted he has "nothing to hide". In a statement, John Hume, the former owner of what is thought to be the world's largest rhino farm, denies allegations that he trafficked the horns from South Africa to South East Asia. Hume (83) and five others, including a lawyer and a game reserve manager, have appeared in court on 55 charges, including theft, money laundering and fraud.