Overkill

Ninety per cent of the world's megafauna has disappeared since humans migrated from Africa and fanned out across the world. Mammoths, mastodons, woolly rhinoceros and the huge carnivores that preyed upon them were soon extinct. The slaughter progressed across Eurasia, the Americas and, finally, the islands. Africa became the planet's last megafaunal sanctuary, its creatures having watched humankind and their weaponry evolve, and learned to avoid them.

But can Africa's megafauna survive