BBC: The stench of the rotting carcass made it easy to track down in the sparse bush. A young male – barely four years old and still an infant by elephant standards – lay on its side in the sand by a river. Around its feet, the sand had been cleared in small arcs – signs of the animal’s thrashing as it struggled to stand and survive. But there was nothing to eat. Nothing. On the ground, not a blade of grass existed, every green shoot had been stripped from the trees. For Iain …