1, Their chest and shoulder muscles that flap their wings are unbelievably strong, and their skeleton is shaped specially to make the muscles fit. If our skeleton were shaped like that, our chests would be 3 ft out in front of our bodies
2, They are aerodynamic. Everything about them, from the tip of their beak to the end of their tail is made for catching wind currents and using them to stay in the air for as long as possible without flapping.
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