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It appears to be for forward balance. Walking has been described as "controlled falling." For a bipedal animal to walk, it is necessary to lean forward in order to extend
http://www.quora.com/Penguins/Why-do-penguins-walk...
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you cannot walk under an aeroplanes wing because when you get upside-down you can fall
http://wiki.answers.com/Q/Why_can_you_not_walk_und...
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Every bird that can fly ahs wings to fly and legs to walk, all birds are born with legs.
http://wiki.answers.com/Q/What_bird_has_wings_to_f...
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Action | Crime | Drama | Mystery | Thriller
http://www.imdb.com/title/tt0613396/
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