The lady I got the eggs from didn't seem familiar with what she had and I didn't get to see all her ducks so I'm just curious. I've had 5 hatch so far. Other than the two pictured the bills are mostly dark but not really black. I have a couple with jet black feet, maybe one yellow and a couple that start yellow and turn black.
Guess away and if you have a specific reason for the guess I'm all ears.