More than 350 elephants have died in northern Botswana in a mysterious mass die-off described by scientists as a “conservation disaster”. A cluster of elephant deaths was first reported in the Okavango Delta in early May, with 169 dead by the end of the month. By mid-June, the number had more than doubled, with 70% of the deaths clustered around waterholes, according to local sources who wish to remain anonymous. “This is a mass die-off on a level that hasn’t been seen in a very, very long time. Outside of drought, I don’t know...