I have a small flock of five ducks I bought sexed from McMurray Hatchery in February. Two Buff hens, two Khaki Campbell hens, and a KC drake. These guys aren't my first group of ducks, so I know what to look for when sexing them. Firstly, my KCs started laying last week. Today, I went out and watched the two Buffs mounting the KC hens, and pressing their vents in a mating position, like what drakes do to penetrate the hens. The Buffs are for sure hens. They quack, there is no drake feather on either one, and they have the color pattern of the hens, not drakes... What is going on? Is this just their way of establishing a pecking order, or do I have butch hens?