That is so cool! I would have never thought that their bills changed color that often and for those reasons! Ducks are awesomeThis is normal across the board. Ducks with orange bills, blue bills and green bills all loose their pretty colors to darker browns and blacks as they lay eggs. I believe this is part hormonal and part nutritional and depends on bill color. Entie May 14th, 2014 hasn't laid any eggs yet (2 months ago she was an egg): Close to pristine.Entie July 29th, 2015 of last year laying like crazy - (the red is watermelon): Very dark and speckled.
Entie January 11th, 2016 before she started laying again: Mostly clear still a little darker.
As a point of illustration on another color bill (they don't freckle as much as orange bills) Here is Rhiannon on Aug 9, 2015 in full lay: (almost totally black bill)
Here she is on December 3rd, 2015 she is on break (and got in a nice not-bleached-yet molt
) (you can see quite a bit of clean green in her bill.)
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