I got my first duck egg from a 17 week old Golden 300! Thankfully it was laid in the nesting box. I just recently added open from the outside nesting boxes in the duck coop. The ducks were so afraid of the new nesting boxes that they wouldn't even go in their coop without "help". lol Now I have a question. The egg is tinted a light green but it is coated with a brownish substance that doesn't wash off. I just cleaned the coop and put new straw in there so it wasn't dirty. Is it normal for a duck egg to be so dirty looking?