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Birds do have hollow bones, but it's not to make them lighter
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Birds have hollow bones, which help them fly.
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Birds Do Have Hollow Bones, But It's Not to Make Them Lighter
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Do Birds Have Hollow Bones? (All You Need To Know) | Birdfact
Birds have hollow bones, which help them fly. | Beautiful Bird Pictures
Why Do Birds Have Hollow Bones?
Some birds have hollow bones, and new research helps us understand why