Mature Snowy drake... note, full green head, claret bib is fully frosted, and claret extends down his sides... also, smoky black in the center of his back feathers... disregard the grey duck to the right, lol...
Just starting to mature female... note the coloring throughout her body... smoky black streaks in middle of her back feathers...
Fully eclipsed drake... note, to the back left is his son, Bubs, still in juvie feathering... very similar...
Eclipsed female... and the wingbar is muted, no longer blue, but note the difference in color from the pic you showed...
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