I have 4 calls that are 4 months now and 2 that are 2 months and every time the younger ones try to come up to the older ones, the older ones beat them up-even to the point of making one bleed a tiny bit next to her bill and hold them down. I know the 4 older ones are all boys and the 2 younger ones I think are both girls, I have never had this problem with my other ducks-I just want all my babies to get along so I dont have to keep everyone seperate all the time especially when they are out running around free ranging