Which risk increases as bird flight speed elevates without compensating air sacs?

💡 Explanation

As bird flight speed increases, inhaled air volume raises without adjusting the compliance through air sacs, potentially causing pulmonary barotrauma leading to tissue damage, restricting efficient respiration. Therefore pulmonary barotrauma risk, rather than aerodynamic wingtip effects, skeletal fractures, or feather separation, necessitates saccular volume moderation with breathing.

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