Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
This image provided courtesy of the National Park Rescue charity shows the carcass of one of the many elephants which have died mysteriously in the Okavango Delta in Botswana. Hundreds of elephants have died mysteriously in Botswana's famed Okavango Delta, the wildlife department said, ruling out poaching as the tusks were found intact. The landlocked southern African country has the world's largest elephant population, estimated to be around 130,000. AFP
In this supplied photo a dead elephant lies in the bush in the Okavango Delta, Botswana. Botswana says it is investigating a staggeringly high number of elephant carcasses, with 275 found in the popular Okavango Delta area of the southern African nation in recent weeks. AP Photo
In this supplied photo a dead elephant lies in the bush in the Okavango Delta, Botswana. Botswana says it is investigating a staggeringly high number of elephant carcasses, with 275 found in the popular Okavango Delta area of the southern African nation in recent weeks. AP Photo
This image provided courtesy of the National Park Rescue charity shows the carcass of one of the many elephants which have died mysteriously in the Okavango Delta in Botswana. Hundreds of elephants have died mysteriously in Botswana's famed Okavango Delta, the wildlife department said, ruling out poaching as the tusks were found intact. The landlocked southern African country has the world's largest elephant population, estimated to be around 130,000. AFP
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
This image provided courtesy of the National Park Rescue charity shows the carcass of one of the many elephants which have died mysteriously in the Okavango Delta in Botswana. Hundreds of elephants have died mysteriously in Botswana's famed Okavango Delta, the wildlife department said, ruling out poaching as the tusks were found intact. The landlocked southern African country has the world's largest elephant population, estimated to be around 130,000. AFP
In this supplied photo a dead elephant lies in the bush in the Okavango Delta, Botswana. Botswana says it is investigating a staggeringly high number of elephant carcasses, with 275 found in the popular Okavango Delta area of the southern African nation in recent weeks. AP Photo
In this supplied photo a dead elephant lies in the bush in the Okavango Delta, Botswana. Botswana says it is investigating a staggeringly high number of elephant carcasses, with 275 found in the popular Okavango Delta area of the southern African nation in recent weeks. AP Photo
This image provided courtesy of the National Park Rescue charity shows the carcass of one of the many elephants which have died mysteriously in the Okavango Delta in Botswana. Hundreds of elephants have died mysteriously in Botswana's famed Okavango Delta, the wildlife department said, ruling out poaching as the tusks were found intact. The landlocked southern African country has the world's largest elephant population, estimated to be around 130,000. AFP
Aerial view of the carcass of one of the approximately 350 elephants that have been found dead for unknown reasons in the Okavango Delta area, near the town of Maun, northern Botswana. This unprecedented death toll for the pachyderms does not appear to be related to poaching, as their coveted ivory tusks are still attached to the corpses. Authorities are performing various tests to determine the cause of death. EPA
