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Birds that fly have lightweight bones some of which are hollow how might this unique body structure benefit the bird?
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Birds that fly have lightweight bones some of which are hollow how might this unique body structure benefit the bird?

User Taras Boychuk
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Hollow lightweight bones benefit the bird by letting it fly. If the bird had regular bones like any other animal, then the bird wouldn't have the ability to be able to fly due to the extra weight.
User Second Son
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