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They have a humped back, so they can swim underwater, with long noses and small flippers.
has the numbers decreased since 1990?
The number of dolphins has decreased by at least half of the population,
bibliography
http://en.wikipedia.org/wiki/Pink_dolphins
www.hkdolphinwatch.com/
http://news.nationalgeographic.com/news/2006/04/0421_060421_dolphins.html
http://video.nationalgeographic.com/video/player/news/culture-places-news/tasmania-dolphins-apvin.html