It has been 4 days since I got 2 beautiful gray/blue colored Swedes to round out the numbers in my flock of Swede/Runner mix. I now have 3 drakes and 3 hens. The problem is that 2 of my boys are just mean with the new gals. They chase and nip and I have seen a few of the girls' feathers on the ground. In spite of this, the new gals want to be as close to the old gang as they can. The 2 mean boys fought each other a little when the girls first got here, but I think they worked that out by the second night. Is the meanness something else that they will work out? Or is it just me overcomplicating duck behavior? I'm not sure if age matters, but my old flock is about 6 months old and the new gals are 8 or 10 months, so I was told. Thanks in advance for any advice from experienced duck folks.