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Q:

Why don't birds feel shortness of breath while flying at high altitudes?

  • 1
    Their lungs are very large
  • 2
    They fly passively
  • 3
    They have additional air sacs
  • 4
    They use less oxygen
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Answer : 3. "They have additional air sacs"
Explanation :

Because flying takes a tremendous amount of energy, birds need to get lots of oxygen. The air sacs in their lungs help them to keep fresh air flowing in, unlike mammals, where the “old” air within the trachea and mouth (which has low oxygen content and high CO2 levels) in inhaled each time.

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