The Yangtze River Dolphin, a unique species of freshwater dolphin, has been on the most endangered list for some time. China’s industrial development, with pollution and habitat destruction, combined with illegal fishing, have driven it over the edge. An intensive survey found not one left. It’s possible that one or two still lurk in the murky waters, but for practical purposes, they are gone. They have been declared extinct and by humans, the first large mammal to be lost that way in fifty years.