The Yangtze Finless Porpoise
The Yangtze River, the longest river in Asia, was once home to two species of dolphin—the finless porpoise and the Baiji dolphin. However, due to man-made environmental changes, the Baiji dolphin went extinct in 2006. Its brethren, the finless porpoise, is known for possessing a “mischievous smile” and the heightened intelligence of a gorilla. Unfortunately, its population is quickly going the way of the Baiji dolphin, currently being listed as “critically endangered” by the WWF. As of 2013, there were 1,000 of them, though that number is thought to have decreased since then.