The main problem I have is when they're outside together, free ranging on about 1/3 acre. 10 chickens, 3 drakes, 4 ducks. One of my drakes thinks he's a rooster because he spent a few months with 3 pullets when his partner (another drake) went to dinner with a racoon one night. He followed those girls all over the place and it was really cute.
Then his hormones kicked in! I tried getting him more girls of his own species. He thanked me, did what drakes do, but still runs after those poor chickens.
(3 drakes? Well, yes. One was supposed to be a duck. The previous owner had never heard a noise out of it and it looks like it's been picked on, so we thought it was a girl. As soon as I brought them home, he tried to protect his girls. Now he looks more beat up than ever!