We have 4 total, 2 are 9 weeks and 2 are 6 weeks old. The older girls are mean to the younger girls! The oldest Pekin chases the younger girls around, kicks them out of the pool, has tried to drown them, and gets so mad she quivers violently before she charges them. The other 9 week old is a runner and is almost as mean but I think she realizes that she's almost smaller now than the 6 week old girls (another Pekin and a Black Swedish) so she only aggresses at them in the pool for the most part. What can I do? I hate to leave the younger girls out there unsupervised with the older girls but we're ready to start transitioning them outside. They have the whole yard (20' x 40') so there's plenty of space for everyone. I don't get it.