African elephants walk through the Moremi Game Reserve in northern Botswana, where a second wave of mysterious deaths among the pachyderms has scientists scrambling.
Murali Narayanan/500px Prime/Getty Images
African elephants walk through the Moremi Game Reserve in northern Botswana, where a second wave of mysterious deaths among the pachyderms has scientists scrambling.
Murali Narayanan/500px Prime/Getty Images