I know someone's already asked this but I can't find the thread to comment on that, sorry! I have 2 female ducks, a pekin and a khaki Campbell. I got them both when they were 2 weeks old and they've been inseparable since, they're now 5 months old and still inseparable, but their pool time has developed in to pulling feathers out of each other. The KC pulls feathers out of the pekin whilst she's swimming round. She holds on to her feathers and pulls them out of her back/sides. She doesn't do anything but quack when it hurts (I assume) and she sometimes locks on to her feather and doesn't pull them out but doesn't let go. The pekin then will climbs on her back and pulls feathers from her sides/neck. I keep an eye out now every time they get on the pool and tell them off each time, usually with a stick of bamboo which they don't like and wave it towards them which seperates them. Not sure why they're doing this, they're inseparable and otherwise get on very well, cuddle up together etc.