It makes sense that birds fly because they own feathery wings.
But it appears that there are other reasons that birds can fly.
Ask anyone on the street what sets birds apart from other animals,
and nine times out of ten they will tell you that it's their ability to fly.
While birds certainly do have their wings and feathers to thank for helping
them take to the air, what most people don't know is that they also have highly
specialized skeletons
that play a large role in making flight possible.
A bird's bones are hollow,
very porous, and extremely light -- in fact, if you were to weigh a bird's
feathers against the same bird's skeleton, you would find that the feathers
weigh more than the bones do!
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