I have WH ducks, 1 drake and 4 hens. They are just starting to lay in the past 4 weeks (born in May) first eggs were fine with nice yellow yolks, past couple weeks I am getting some that have a kinda yucky khaki or pale olive color yolks? I pick them up every day and am getting 4 eggs a day. Somewhere I read that eating acorns could cause this? If that could be right it would make sense as they free range during the day and we have TONS of acorns especially these little small ones EVERYWHERE. If this is it are the eggs ok to eat? Been giving them to the dogs.