Why are we still killing Bluefin Tuna? This question has resonated through the ocean blogosphere recently, as various experts weigh the issues surrounding overfishing and wonder why, when we know how limited the Bluefin Tuna populations are, and how precipitously they’ve declined in the last decade, do they demand record-breaking prices able to support an industry that must range further afield to chase that last, lonely fish? Other conservation writers discuss the recent extinction of not one, but two, rhinoceros species and ponder the fate of large terrestrial mammals. Knowing how rare these rhinoceroses were, why did they continue to be poached? Where does this demand come from?