na2neErikam5painez na2neErikam5painez
  • 21-12-2016
  • Biology
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Why do birds have hallow bones?

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greenacres greenacres
  • 21-12-2016
The hollow part of a bird bone isn't wasted space. In some bones, the hollow cavities contain extensions of the air sacs from the lungs. These air sacs help the bird to get the oxygen it needs to fly quickly and easily.
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