Long story short we have one chicken and one duck left. Recently the chicken has been attacking the duck. Since we got the duck the chicken has chased her but recently the chicken started pecking at her and now is pecking hard enough to pull out feathers. We have had the chicken since April and this duck since September, but they have been together since we got the ducks. Unfortunately the other 5 chickens and 3 ducks have been killed. We finally have built a brand new coop for them and even fixed it so the birds are separated but can still see each other. We do plan on getting new birds in the spring but are afraid the chicken will hurt them. Is my chicken just mean or could there be something else going on? She has never pecked at any of us humans and actually wants attention from us when we go out to the coop. I let both birds out in to the run all day long and only lock them up at night. Any helpful suggestions?