Which risk increases when punctured avian air sacs lead to subcutaneous emphysema during sustained flight?

💡 Explanation

When air sacs are punctured, air leaks into subcutaneous tissues because there is loss of pressure differential controlling air flow, leading to emphysema and compromised insulation, causing impaired thermoregulation, shortening flight duration. Therefore impaired thermoregulation risk increases, rather than blood oxygen changes, reduced lift, or altered predator risk, due to insulation failure.

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