What are some of the personality differences in the two that you all have noticed? Our Peking is hilarious, the two Rouens are 4 weeks old and they just want to run from us. I think they think my grand daughter is their mother, because when they were smaller they use to follow her around the yard in a single file. They were right on her heels making it scary that they would get stepped on. They don't do that any more though you have to chase them down to put them up I'm getting worried about sex of the two Rouen babies from what I have been reading on here I hope both are not males. If I would of known more about them I would of ordered them sexed so we would have more females. The two look exactly alike so at this point I think they are the same sex. They don't quack they just doing the peeping thing, like crying when you leave them or take one away from the other. When do they start quacking?