The lungs of a bird expand as it inhales and contract as it exhales.

Name: The lungs of a bird expand as it inhales and contract as it exhales.
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Birds have a unique respiratory system where air flows in one direction through their lungs, allowing for more efficient gas exchange. Their lungs do not expand and contract like mammalian lungs; instead, air is moved through the lungs by changes in the volume of the air sacs.

The Lungs of a Bird Expand as It Inhales and Contract