Can anyone help we have some free range ducks, they are healthy and acting normally. We collect their eggs daily when the eggs are clean, on cracking the egg- she shell is normal- nice and strong with good shape and a smooth shell. The problem is the yolk colour- is almost brown! We have some hens eggs that are so orange they are almost red but never had brown yolks! I know they are fresh as we collect from the ark not found under cabins etc.