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Botswana reveals the cause of a mass elephant die-off after months-long wait

Test results on samples collected from the carcasses pointed to a naturally occurring toxin produced by cyanobacteria.

A young adolescent African elephant stands next to an older bull in the Makgadikgadi Pans National Park in Botswana.
A young adolescent African elephant stands next to an older bull in the Makgadikgadi Pans National Park in Botswana.Read moreConnie Allen / AP
    by Mqondisi Dube and Max Bearak, Washington Post
    Published