We have 2 Mallards and 2 Pekins that are 4 weeks old. We just moved them to their new duck house outside this past Sunday. We live in California so we are having hundred degree days at the moment. In the afternoons they are all panting so I’ve been spraying them with cool water which they love and then as much as we can we let them swim in a kiddie pool. The smallest duck (a mallard) has been chasing the 3 other ducks and nibbling around the ducks legs. No idea if it’s a male or female but it’s the smallest so for now we refer to it as her and we named her Winnie. She’s getting more aggressive and will grab the feathers and try to pull them. The Pekins let out a cry and try to swim away from her. When there’s treats like tomatoes or grapes in the water she’s focused on that but as soon as those are gone she chases the other ducks. I’ve read about duck cannibalism and so I want to do anything I can to fix this early on. Any suggestions?? We feed them Purina flock raisers and give them fruits and vegetables. Is there something missing from her diet?