The mass deaths of at least 330 elephants in Botswana this year was due to poisoning by cyanobacteria in water, officials said Monday. “Our latest tests have detected cyanobacterial neurotoxins to be the cause of deaths,” Mmadi Reuben, principal veterinary officer at the Department of Wildlife and National Parks, said while announcing the results of investigation into the deaths which alarmed conservationists. Cyanobacteria are microscopic organisms common in water and ...