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The bright purple color arises not from pigment but from refraction of the incident light by cells in the feathers with a quasi-ordered periodicity comparable to the wavelength of light. 6/13/12 2:39:39 PM   010-20120613_RGS_4751.JPG   700.0 mm   1/800 sec   f9.0  ISO 400  Exp Bias --1.3   OFF - Compulsory flash mode   Canon EOS-1D Mark IV  Lat= N 039° 30' 42.35", Long= W 120° 08' 37.57"   Google Map