I have two almost 1-year old Pekin ducks. Both were supposed to be females but I regularly catch one of them mating the other and 'she' is much bigger than the other one. Is this common or could I have a Drake in the mix? I get two eggs a day from 'them/someone', so not sure if one is laying two eggs or one from each of them. Tail feathers are the same and they quack (loudly and bossily). Question #1: Common for two females to mate? Is this establishing a pecking order? Question #2: How do you tell the Gender of a white duck? I just got 3 Khaki Campbells ducklings and have 4 more (female) Pekins coming tomorrow. I do not know the gender of the Campbells (yet). Question #3: Should I introduce them to the two older Pekins or give them two different runs to be in. Afraid the older ones won't be nice to my younger ones. Question #4: If by chance I end up with a Campbell Drake, will he mate with my Pekins? And is this bad...? Thank you for your advice!!