So I am looking at introducing a 6 week old female runner duckling to my flock of 2 males & 1 female runners that are 13 weeks old. I was advised by some folk on here I either needed to thin out my males or add another female, due to conflict that will probably occur in the near future. Will a 6week old be ok to add with my 3 already? Could she be harmed? Could they reject her? Am I best finding an older female/same age? The new duckling is from the same man I got my 3 from but he has no females that are older than 6 weeks. My 3 are currently in molt & I'm starting to see behaviour changes. My female is incredibly bossy/dominant/noisy in the pool & my males must think they are the most beautiful drakes on earth. She also sticks her butt in the air whilst in the pool (I don't mean ducking her head in the water, I mean just sticks her butt up a little like she's flirting?) will this behaviour be bad to have around a new baby duckling (whatever this behaviour is)? I don't want to add a young one for something bad to happen to her & of course I don't want conflict between the 3 I have now any advice on this would be great as a few of you already know I'm very much a newbie to duckies! Thanks.