My female duck hatched 9 ducklings on June 10th. The male duck became very aggressive, chasing them and pulling out feathers. I removed him from the enclosure but I am wondering when or if it will be safe to put him back in. I have tried to reintroduce him now that the ducklings are bigger but he constantly chases them and tries to mount the females. It seems like he is trying to get the ducklings away from the mother, but he doesn't try to mount her. I have tried to put just the female and the male together, but she stresses out about being away from the babies. Help, is this normal? What should I do?