I agree, I understand why they want to keep them pure, but in the case of myself and chickenlisa, for example, it is highly likely that the eggs would be pure. Hers especially, as I believe she has swedish ducks and drake(s) and cayuga ducks. Mine is a bit more of a mix, though my cayuga is hiding her nest, and the pair sticks together. It would be possible for the drake to mate with the other ducks, but each group is very protective of their 'women' so it is highly unlikely. I just think it is silly how many different swaps there are for eggs right now, everyone is being so picky!