Our Rouen drake has some color changing going on. He's just over a year old. In the picture you can see the lighter color coming in around his lower beak, a few speckles near his upper beak and above his eye. What doesn't show up in the photo is around his eyes is turning from the emerald green to what appears to be black.
Is this normal or should I be concerned? Is he molting? I should mention he and our female are the first and only ducks we have had.

Is this normal or should I be concerned? Is he molting? I should mention he and our female are the first and only ducks we have had.