In 2006, the dolphin who lived in the Yangtze River in China, was presumed extinct. In Brazil, a close cousin could reach the same end.
Use of dolphin baits for fishing is reported several years ago, but only now has become actions against the killing.
Bolivia has a unique species in the country that lives in lakes and rivers of the Amazon.
The severe drought experienced by the Amazon in 2010 halved the amount of pink dolphins. But now the species is recovering.