Ask Dr. Universe: How can birds fly but people cannot?
PULLMAN, Wash. – No matter how much you flap your arms or I flap my paws, gravity keeps us pulled to Earth. But when birds use their strong muscles to start flapping their wings, something amazing happens.
A big part of the reason birds are able to fly is because their wings create airfoils that can split the air. We also find airfoils in the shape of tiny wings on bugs or huge wings on airplanes.
Read all of this answer from Dr. Universe at https://askdruniverse.wsu.edu/2016/09/19/can-birds-fly-cant/.
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