endangered finless whales are classified as ' critically endangered ' by WWF . Only surviving species in the Yangtze since river dolphins made extinct . Just 1,000 finless porpoises survived - and could be extinct with 100 years . WWF and Institute of Hydrobiology now initiated program to save species . Organisations , with the help of local volunteers , managed to reverse decline .
Yangtze finless porpoises are classified as 'critically endangered ' by WWF . Only surviving mammals in the Yangtze since river dolphins made extinct . Just 1,000 finless porpoises remain - and could be extinct with ten years . WWF and Institute of Hydrobiology now launched program to save species . Organisations , with the help of local fishermen , hope to reverse decline .