Hello everyone! This is my first time ever owning ducks and i have 6 mallards...they are so cute and they are about 4 weeks old. I have a question about their coloring. Two of them have a very visible green sheen on their head, and im wondering if this means that these two will be boys???? Ive read alot on here about not truly knowing until after their first molt, but it seems so weird to have them get the green on their head and then turn out to be girls!! Thank you all for your help...I truly love this website and i am on here allllllll the time hehe!!