Ok, among the many chickens we have, we have 3 RIR roos. Two of which are fine but the third one keeps attacking my little duck, who is actually about the same size. The other day when the roo attacked Duckie (yea, her name is Duckie lol) he looked as though he was trying to mate her which I have seen with my MIL's previous roosters trying with her Mallards... I'm aggravated b/c none of our other chickens do that. I have actually been trying to sell the 3 roos but no success... Ok, so here's a question: WHY is this little roo doing this???