A pair of elephants walk through scrub in the dusk light in Pilanesberg National Park in South Africa's North West Province April 19, 2012. A pair of elephants walk through scrub in the dusk light in Pilanesberg National Park in South Africa's North West Province April 19, 2012. The carcasses of some of the 22 elephants slaughtered in a helicopter-borne attack lie on the ground in the Democratic Republic of Congo's Garamba National Park, in this undated handout picture released by the DRC Military. A record number of big ivory seizures were made globally in 2011 and the trend looks set to continue in 2012 as elephant massacres take place from Congo to Cameroon, where as many as 200 of the pachyderms, listed by the International Union for Conservation of Nature as "vulnerable", were slain in January. less Activists gather as they take part in a protest against Rhinoceros poaching outside the Chinese embassy in Pretoria, South Africa March 29, 2012. Four staff members at South Africa's flagship Kruger National Park have been arrested on suspicion of killing rhinos and selling their horns to criminal syndicates, the park service said on Wednesday. Activists gather as they take part in a protest against Rhinoceros poaching outside the Chinese embassy in Pretoria, South Africa March 29, 2012. Four staff members at South Africa's flagship Kruger National Park have been arrested on suspicion of killing rhinos and selling their horns to criminal syndicates, the park service said on Wednesday. A Kenya Wildlife Services ranger guards a shipment of elephant tusks during a commemoration of the 1989 ivory burning at the Nairobi National Park July 18, 2009. A Kenya Wildlife Services ranger guards a shipment of elephant tusks during a commemoration of the 1989 ivory burning at the Nairobi National Park July 18, 2009. Members of the Pilanesberg National Park Anti-Poaching Unit (APU) stand guard as conservationists and police investigate the scene of a rhino poaching incident in South Africa April 19, 2012. Members of the Pilanesberg National Park Anti-Poaching Unit (APU) stand guard as conservationists and police investigate the scene of a rhino poaching incident in South Africa April 19, 2012. Photo By REUTERS/Mike Hutchings