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Published on Jan 29, 2010
Marine biologist Tooni Mahto and conservationist Philippe Cousteau, grandson of Jacques Cousteau, swim with a group of the whales, witnessing rare behaviour of the social structure of these magnificent animals. Spectacular footage from the BBC's Oceans series. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth