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Great shots, you captured the colors and expressions really well. I'm curious, did you process the images at their original EV and pull the shadows/blacks up a lot or increase the exposure in post? There's seems to be excessive noise in the photos of the drake(s) for shooting at ISO 400-500. For me the noise detracts from the image quality every so slightly. My apologies if the criticism is unsolicited, the photos are excellent despite my nitpicking.
...edit for clarity