More than 300 elephants in Botswana have been killed by toxin-producing cyanobacteria in waterholes, government wildlife officials said Monday. But that explanation doesn't satisfy some conservationists. [https://edition.cnn.com/2020/09/21/africa/botswana-elephant-deaths-intl/index.html](https://edition.cnn.com/2020/09/21/africa/botswana-elephant-deaths-intl/index.html)