So I have a Rooster, two chickens and two ducks. Recently one of the ducks got killed by a predator. We may have to move so we did not immediately get a new duck and was happy when the duck made friends with the Turkey. One of the chickens who never gave us trouble all of a sudden started attacking our lonely duck. The other day we came home and saw that the duck looked stunned, he had been fine that morning, upon closer look we saw its eyes looked infected.