Elephants are mysteriously dying in Botswana

More than 350 elephants in Botswana have been mysteriously died since May, in a phenomenon that some scientists have dubbed a "conservation disaster," and one that has evaded explanation.The elephants — which died in the swampy Okavango Delta — still had their tusks intact, suggesting that ivory poaching hadn't driven the deaths, The Guardian reported.

A flight over the delta in May by researchers with Elephants Without Borders, a wildlife conservation organization, first spotted 169 carcasses; that number jumped to 356 in June, when the conservationists took another flight over the area.

Guest: Tim Neary - Naturalist conservationist