This is a video of our four female Khaki Campbells. It was raining, and they were doing this weird thing where they were laying on the concrete and sticking their tails up in the air and their anuses were very visible. At one point, one of the ducks stood on the other's back so we thought maybe they were pretending to breed each other. There was a little bit of a mucousy substance coming out of their behinds. Were they pretending to be swimming, breeding, or what? Can anyone tell us what's happening here? They have not started to lay eggs yet.