We have always raised chickens and with my newest batch, I also grabbed 5 ducks. I currently have them all in the same yard. I've been cooping them separate at night due to room but was going to move them to a bigger yard with the larger coop to house together. I was discouraged by someone to do so because she said the male duck would attempt to mate with my hens and kill them. (Apparently hers did this) Is this common? Any advice?