Over 600 rhinos in South Africa have now been slaughtered by poachers in the country's wildlife parks since the beginning of the year. Game rangers and other experts say they are working round the clock to crack down on poachers. But the formidable rhino remains vulnerable to the greed and violence of cold-blooded wildlife criminals. CCTV's Rene Del Carme brings you that story, but please be advised some of the following pictures are of a graphic nature.