I have a female duck that was born about the first of May and a young female chicken born about the middle of June. I have tried just about everything to smoothly put them in with my adult female chickens, including putting the biggest trouble maker in the flock in a crate and keeping her away from everyone else for two weeks. I have tried to get the duck to poke the adult chickens with her beak, but she ends up with sore eye lids because the adult chickens go after her and peck at her eye. It is a good thing she has kept her eye shut tight or she might be blind in that eye by now. The young female chicken just runs from the other chickens frantically for her life. I didn't know I couldn't add anything to my flock. It seems that you have to totally start over with all babies raised together to have a group get along. I guess I'll always have to keep the duck and chick together in the outside covered pen at night and in a fenced yard during the day or in a crate at night. It's sad because I love them so much and can't stand having anyone hurt. Any suggestions would be appreciated. Thank you.