There is a reason for this madness. Last week, I asked Mama Cormier about the symmetrical ducks which one is male and which one is female? Of course, we can’t tell the difference!
But one duck has a funny rear and there is a “tell tail” sign. Taking a photo from the rear end, this is definitely a female. As you can see, the bulging behind on this one that is kind of lumpy. I think these are eggs in the making. What do you think?
As for the rule, I am throwing this in.