As I did say "...especially at the edge of the wing!" - and read the Alan's last post. And what part of the bird will make that "shade" (especially making that triangle white spot where the normal shade should continue)?! Blue, partially transparent ribbon (if the darker spots, also at the edge of the wing, are not wrinkles!!).It is a shadow. Camera white balance pulls brightest details to be white. Those are in direct sun so contain red part of sun spectrum. White feathers in shade receive only diffuse light from sky that is predominantly blue.
Any shade on white or gray is of opposite colour balance to the light source. Just look at old school watercolour masters, J.W.M. Turner conveyed the warmth of the scene by fooling our eyes by cool blue tones in shades.
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