Here are some facts and figures on the rhino population across the world and on the highly profitable rhino horn trade.
:: Today there are fewer than 29,000 rhinos surviving in the wild across Africa and Asia.
:: At the beginning of the 20th century there were 500,000 rhinos and in 1970 there were 70,000.
:: However, after the poaching wars of the late 1980s and early 1990s, the number of white rhinos has been increasing by around 9.5% per year and of black rhino by around 6% per year, thanks to conservation efforts.
:: Adult rhino horn weighs at least 8 kilograms (17.6 pounds)
:: A poacher makes £8,000 per kilogram
:: When the handler sells it on, the price can increase 10-fold to about £80,000 per kilogram.
:: An adult horn can be worth up to £800,000.
Sources: Andrew Desmet, Park Ranger at Kruger Park and savetherhino.org