From now on, the only place you’ll see this subspecies of black rhino from western Africa is in photographs or stuffed in museums. That’s because this year, the western black rhino (Diceros bicornis longipipes) is officially extinct, and others are clinging on by a thread. In all, the International Union for Conservation of Nature says that a quarter of all mammals are at risk of extinction. It’s not all bad news though. One of conservation’s success stories is (Ceratotherium simum simum), a subspecies of the African southern white rhino, which has soared in number from less than 100 individuals to 20,000 since the end of the 19th century.