The Yangtze Freshwater Dolphin Expedition 2006 (Chinese: 长江淡水豚类考察) was a six-week search expedition undertaken in November and December 2006 in central China in an attempt to locate continued proof of the existence of the endangered baiji Yangtze dolphin (Chinese river dolphin). It was carried out under the direction of the Wuhan Institute of Hydrobiology and the Swiss-based baiji.org Foundation and was notable for drawing to an end without any positive results. Thus it was announced that the species was functionally extinct.