Sounds like they’re all female, sorry I don’t have any more advice it’s puzzling me why they would attack each other. I hope you find a solution to fix it 😊
Sounds like they are mating.. are the two ducks male? Or at least one of them is male? If so they are probably trying to mate with her and if she tries to get away they will become more aggressive in their attempts (pulling feathers and injuring her) if so keep an eye on her and make sure they...