I had heard several different things regarding whether it was possible due to different requirements for humidity and temperature. Well I stuck some of our runner duck eggs under a broody hen and out popped 6 cute ducklings! I don't know how confused she is or if she even cares, but my chickens and ducks all live together so hopefully they will figure out all the ducky stuff by watching their parents and not try and roost with the hens. Although that would be interesting to see!!