One name has always been on the lips of scientists who have spent their careers studying the tropical jungles of Papua New Guinea: Mount Bosavi. Biologists had long harboured a hunch that this extinct volcano, its enormous crater filled with rainforest, could contain a treasure trove of undiscovered species. Animals unable to move beyond the 1,000-metre crater walls were thought likely to have evolved in distinct ways after thousands of years in isolation. Read more