The theory says birds can't have wings good at both flying and swimming, and penguins made the trade off. Powered by NewsLook.
via LiveScience.com http://www.livescience.com/34579-new-theory-may-explain-how-penguins-lost-their-flight.html
via LiveScience.com http://www.livescience.com/34579-new-theory-may-explain-how-penguins-lost-their-flight.html
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