I have two male American Pekin Ducks and for some reason they just seem not really aggressive with each other but act like they fight. Not sure what to really call the behavior. They don’t let each other in the pool and one is sorta just always antagonizes the other one. Goes for his feet, neck his feathers on his back etc. not sure what it is or why they do this. My big one keeps limping because the smaller one keeps attacking his foot. Always the same foot. Just looking for advice to help with the behavior or anyone know what or why it is or they do this ? These are them.