I have a vision of Bill being buried with his last remnants of Ivory piled up on his lap. In a few thousand years time when the Earth is dead, visitors from outer space will be excavating the planet and thinking they know everything about what used to be the human race, when, suddenly one of them chances across Bill's burial mound - of course his bones will long ago have turned to dust, but the alien will announce that he has found a different species- one that had a cock of Ivory.