Does it have to do with insufficient lift or just not practical?
In: Physics
There are three things that make a bird much more suited to flight than a human:
* Bone composition. Many birds have much less dense bones than humans, which means they have less weight hindering them from taking off.
* Musculature. Bird have huge chest muscles to allow them to flap their wings.
* Feathers. Feathers give birds’ wings a ton of surface area to fan the air with, generating lift.
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