Why different calls

[emae623]

So we bought a few call ducks this spring and ended up with two white ones but I cannot figure out why one is a typical white call with orange feet and bill but the other has black feet and bill and is getting a dark spot in its wing? All of my calls are fully colored so this is a wierd final color!? Just looking for thoughts.

 

[WVduckchick]

It’s not white. It’s like an incomplete silver, I think
I have one too, she just hatched ducklings last weekend.