I just got two cayuga ducks from a friend as he is moving to africa and I have a few questions. Are they both male, a pair or both girls? 1 is almost half the size of the other and has a crooked beak and otherwise seems just fine and is completly black. The larger of the two has been mounting the smaller but I read somewhere that onle females have white feathers and 'he' has one white feather so have I got a lesbian duck? It has the curled feather tips on it's tail so I'm guessing male? The smaller doesn't and their the same age so have I got a pair? Do they have any special diatary needs, I keep chickens and the guy said I could just give them layers pellets. What kind of treats do they like? Anything else I need to know?