I had a nice little happy flock 7-8 week old chicks and 2 gray mallards. The chicks use the mallards as fluffy pillows they all love each other. I longed for call ducks and found 2 ..7 week old grays..hens. I worried my mallards being g bigger would pick.on them. No these tiny little fluffers are mean... They pick.on the chicks..they pick.on my mallards.. Mean girls !!!! Is this normal? Now I know why he got rid of them.. *sigh
Ducks actually can have emotional difficulty with change, from what I have seen and read. You may have two girls acting out because they are terrified. I would divide the brooder so that they can be next to everyone else without touching, put an unbreakable mirror in with them (more of their "own kind,") and give everyone treats at the same time so they can associate good things with being around each other. Introductions can be a "one day at a time" project.
I did separate them into a wire kennel inside the brooder. When everyone goes out to the day yard with the pool they aren't mean. For some reason in the brooder they attack . Everyone can be laying down and one of the new kids will charge and bite butts and wings. So for now they are restricted.
