More than 350 elephants have died from unknown causes in Northern Botswana
The government has yet to test the carcasses for traces of poison or pathogen
Locals say around 70 per cent of the deaths are happening near waterholes
Hundreds of elephants have mysteriously dropped dead in Botswana in what is being described as a 'conservation disaster'.
More than 350 elephants have died from unknown causes, with aerial photos showing their carcasses scattered across the Okavango Delta and other northern parts of the country.
The first unusual deaths were reported in May when 169 elephants died in a short period at the Okavango Delta, a marshy and lush wildlife habitat.