Satellite data analysis suggests algal blooms could be behind mass die-off in Botswana that sparked flurry of theories in 2020

More than 350 elephants that died in mysterious circumstances probably drank toxic water, according to a new paper that warns of an “alarming trend” in climate-induced poisoning.

The deaths in Botswana’s Okavango delta were described by scientists as a “conservation disaster”. Elephants of all ages were seen walking in circles before collapsing and dying. Carcasses were first spotted in north-eastern Botswana in May and June 2020, with many theories circulating about the cause of death, including cyanide poisoning or an unknown disease.