I have two female ducks, they are glued together all of the time. Never more than a few inches apart from one another. The other day one of my dogs got out of the kennel - my dogs are normally fine around the ducks/chickens but I guess when unsupervised he took advantage of his freedom. He killed one hen, and apparently grabbed one of the ducks. I found that duck in the barn, huddled in a corner, one wing a little injured but she uses it so I don't think it's broken. The other duck was nowhere to be found. I was very worried, until the next morning there she was in one of the doghouses in the chicken coop. The ducks both can fly, so when they roost they are normally up on the kennel fencing, or in a tree, not on the ground in the barn or in the dog houses. Anyway this duck obviously thought her friend had been killed, because she wouldn't come out of the dog house to eat or anything, just sat in there. After checking over the injured duck, I carried her out and set her down - the other duck peeked out, brightened up and they had a wonderful happy dancing noisy reunion - very cool to see. Chickens simply don't have this kind of relationship going with each other, these ducks are best friends, I hope they don't lose one another or I'd have to go find another duck to hopefully take the lost one's place.
molly