I have 2 Swedes that I raised from ducklings (they'll be a year old next month). I ended up with one duck and one drake. But, the ONLY way I could tell them apart was because my duck was the LOUD one. Seriously. Her quack is quite different from his quiet, raspy quack. Hers is crystal clear. His was always raspy and much quieter. Their bills and feet looked quite similar when they were younger and I never noticed if one's feet are brighter orange than the other... I'll have to look when I get home. Now, I'm curious. LOL