Study shows tragic drop in African elephants

Scanning Botswana's remote Linyanti swamp from the low flying chopper, elephant ecologist Mike Chase can't hide the anxiety and dread as he sees what he has seen too many times before. "I don't think anybody in the world has seen the number of dead elephants that I've seen over the last two years," he says. From above, we spot an elephant lying on its side in the cracked river mud. From a distance it could be mistaken for a resting animal. But the acrid stench of death hits us before we even land. Up close, it is a horror.

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