Which biomechanical effect maximizes soaring efficiency when raptors utilize thermal updrafts?

💡 Explanation

When soaring in thermals, raptors use wing morphing because adjusting wing area and airfoil profile reduces induced drag and sink rate, which allows them to stay aloft with minimal energy expenditure. Therefore minimal sink rate increases endurance, unlike alternatives requiring more energy input which are for powered flight or maneuvering.

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