Duck grooming chicken

[Miss Lydia]

I do have a drake but he has not shown any interest in the hens. He will chase a hen if she happened to pick on one of the duck hens. I see this as more protective behaviour though.

Yes I see it here too, My drakes don't go after any chicken hens but I try and give my drakes many girls, I think it depends on the drake,breed and if he has his own ducks.