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Here, although the hummer has hardly moved, the color around the throat is is all but gone. Current theories say that the color arises from the scattering (reflection, refraction) of light by tiny air vacuols in the keratin structure of the feather barbs - not from pigmentation. It's early morning and most of the light from the bird is backscattered from the flash. Maybe that large well-defined scattering angle makes the color very sensitive to a small change in angle?........ .700.0 mm 1/200 sec...f5.6...Exp bias +0.0......ISO 800...ON - Compulsory flash mode Canon EOS-1D Mark IV 3/31/11 6:50:37 AM... . ..BE3I3097a.JPG