A size-comparison image of the Goldeneye vs the Mallard. Note, both have irridescent green colours of the head in good light, the Mallard more so than the Goldeneye. In this image, taken in dull light, I had to coax-out the green of the Goldeneye a bit in PS by isolating the head and slightly increasing the colour saturation. The Mallard's is as shot with only minor overall adjustments to the image in PS.