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Peregrine falcon flying hard with downward wing stroke bending the primary feathers upward. The airfoil wing form is evident. © David A. Ponton
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© David A. Ponton
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AERIAL ECOLOGY I: PEREGRINE FALCON HUNTING BIRDS IN FLIGHT
Peregrine falcon flying hard with downward wing stroke bending the primary feathers upward. The airfoil wing form is evident. © David A. Ponton