I have 5 young ducks in a pen near the house, ages 2 1/2-3 1/2 months. I also have 10 adult ducks that are out on the pond. It is prime mating season for the ducks, and most of the 'babies' are girls, and are also the youngest ones of the group. I'm afraid that if I move the babies to the pond, the adults will bully them too much and hurt them. They haven't had much access to water, so I don't want the adult boys drowning the young girls. At what age should it be safe to move the baby ducks to the pond with the others?