Puzzle of why penguin cannot fly 'solved'
Researchers believe that the bird's underwater prowess may have cost it its ability to fly.
By looking at seabirds closely related to the penguin, scientists confirmed that a wing that is good for flying cannot also be good for diving and swimming.
The study is published in the Proceedings of the National Academy of Sciences.
Professor John Speakman, from the University of Aberdeen and the Chinese Academy of Sciences, said: "Like many people, I've always been interested in penguins, and seeing them do these phenomenal marches across the ice, I've often thought: 'Why don't they just fly?'
http://www.bbc.co.uk/news/science-environment-22601223
High flight costs, but low dive costs, in auks support the biomechanical hypothesis for flightlessness in penguins.
http://www.pnas.org/content/early/2013/05/16/1304838110
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which is surprising considering I'm UK. great video. Great !
Its odd they can't fly but can tap dance. 
