flight is a more complicated process. The bird's wing changes shape
during both the up and down stroke. It also changes its angle of attack
depending on how much it presses down and how much it pushes backwards.
Flapping flight is basically rowing in the air with the added complication
that it needs to generate lift as well. Wing loading is another important
way of assessing how and how well a bird flies. Wing loading is the
ratio of wing area to weight.
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