In my observation, the difference lies not just in muscles but in the very architecture of the wing. Birds have powerful pectorals for strong downstrokes, bats' flight is more dexterous with their flexible hand-wings, and insects achieve marvels through rapid contraction of indirect muscles that warp their whole thorax. But the obvious answer misses the crucial role of air itself in our dense, mist-laden valleys here—these creatures are dancers in a fluid we cannot see. I say this after years of filming owls at dusk near my station; their silent flight through wet air defies every textbook diagram I ever learned from.
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