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That’s surprising, because the unidirectional airflow of birds was thought to have evolved due to the high-oxygen demands of flight: Instead of being partially filled with stale, depleted air like human lungs, avian lungs contain air with a much higher average oxygen content and are much more efficient at getting oxygen to the blood.
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So this method of breathing was generally considered to be unique to both warm-blooded animals and birds.
Source: Here
So this method of breathing was generally considered to be unique to both warm-blooded animals and birds.Source: Here
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