Hollow skeletons are also known as pneumatized bones since they are filled with air space.
Hollow skeletons or Pneumatized bones
This arrangement is supposed to aid in oxygen intake during flying. The ulna is the cavity within a bird's bone.
The air-filled skeleton of some birds is so light that the bird's wings weigh more than its complete skeleton.
In addition to having lungs, birds have specific air sacs with hollow skeletons that allow gases to circulate more freely about the body.
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