Did toxic algae kill hundreds of elephants in Botswana? / Killing elephants for their meat could solve two of Zimbawe's problems / Drought-stricken Botswana to kill, eat 20,000 elephants unless Germany takes them -- report / Hundreds of elephants to be killed in Zimbabwe and Namibia as food and water resources run dry / Female elephants rumble to say 'let's go!' Namibian study shows males do too, a sign of unexpected social bonds