Which risk fundamentally escalates as avian migratory flight commences after significant premigratory fat loading?

💡 Explanation

As fat loading increases prior to migration, blood viscosity rises, impacting oxygen delivery, and upon commencement of flight, increased metabolic demands lead to heightened hypoxia. Therefore, hypoxia becomes crucial, rather than predation due to the visibility of large flocks, or heat stress averted by altitude and air sacs, or maneuverability reduced less than alternatives.

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