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Why can't birds fly in a vacuum?
Birds generate lift by using Bernoulli’s principle just like an airplane. The shape of their wing causes fast moving low pressure air on top of the wing and slow moving high pressure air under the wing. This high pressure air pushes up on the wing making lift. The key component for lift in all of this is air. Without air, like in a vacuum, it is not possible to generate low and high pressure around a wing and so the bird cannot achieve lift.