Fifteen years ago, there were half a million elephants in Africa. But illegal hunting, known as poaching, killed more than 100,000 of them between 2006 and 2015 and continues to take a toll, according to the International Union for Conservation of Nature. Poachers kill elephants for their tusks, which are made of ivory that’s in high demand in China. Now poaching is even on the rise in Botswana, long considered a safe haven for African elephants.