Ducklings first. Not sure if it matters, but the lighter colored one is grown up and is a drake.
Swedish blue drake on the left, pekin hen on the right
The one inside the pool is the pekin hen, and outside is the drake. With them so close together you can sort of see the differences in body...
I have some duck pictures if you want to use them? Not for me personally, as I don't have any money, butif you wanted to use them as a reference? The breeds I have pics of is adult pekin (hen and drake) and adult blue Swedish drake. I also have a pic of mallard and Rouen ducklings.