The Yangtze River dolphin enjoys a rare and depressing distinction, according to new research. The grey white, long-beaked animal is the world's first cetacean -the order of whales, dolphins and porpoises -to be made extinct by man, concludes an international team that has conducted comprehensive surveys of its habitat. The demise of the near-blind mammal also represents the first extinction of a large vertebrate (backboned animal) for more than 50 years, since overhunting claimed the Caribbean monk seal in the 1950s. A zoologist said it was a "shocking tragedy." The paper, lead-authored by Dr Sam Turvey of the Zoological Society...