My white runners were 15 weeks old yesterday, their tails both got curls last week..I was really hoping for a pair since they have different parents. So anyways I have muscovy & 2 blue swedish males- SO i let all the baby ducks in with the adults after the predator problems & now the poor things are being pinned down & mated all day, they are even pinning down my big baby muscovy male..not old enough to hiss..but its def a male. Why would they be doing this?..the poor runners are so delicate compared to the others & theyre BOYS!! . Cant the adult male ducks tell theyre boys?..The poor runners are taking the worst of it, 3 ducks at once & theyre bills were all bloody yesterday from it. I decided to move the 3 big males into confinement until i can figure out what to do.