My older Mallard (supposedly female), is the most feathered out of my little flock of 3 Mallads and 1 Rouen, all 4 and 5 weeks old. She's half the size of the Rouen, also 5 weeks old, but not that much larger than the 4 week old Mallards. She has become very aggressive to the rest of them. I have 3 water and 2 feeding stations set up, all quite far apart and she literally chases them off of any station they go to with a good butt/nip in the side with her bill. The little ones are constantly squealing from her poking at them, and the Rouen even gives a good, I call it a bark, every now and then. It's too early to sex them, I know, but even if she is a he, (the mallards are supposed to be females, we don't know about the Rouen), is this normal behaviour? I know about the pecking order, but this seems a little extreme. She's even yanked a feather or two out of one of them. They were in the bathtub until yesterday and I gave them the run of the whole bathroom yesterday because I thought being too crowded might have been causing the behaviour. But she's just as bad, except now she has more space to chase them! She was a lone duck for about 5 days until we got the Rouen and then the younger one's came a long a week later and we put them all together about 5 days after that. They were all fine until about 3 days ago and now the behaviour is almost constant, except when they are sleeping, when they are cuddled up together. It's about 74F in the bathroom and I still have the red heat light on. Is it time to turn it off and get them use to a regular night and day schedule. Becuz the young one's are a week behind, I haven't wanted to push it. I am all for letting nature takes it's course, but she's starting to tick me off!!!!