Hi I have 6 Pekin Ducks, which I love and have hand fed them since babies, they are getting big now and I just found out I have 4 boys and 2 girls, I am working out of pen so I can keep them separate, can all four of my boys live together and the girls live in a a different one? Also I noticed my one female neck is always on her shoulder blade and she doesn’t stretch if unless she’s cleaning herself is there a reason for that?