Can someone tell me the difference btw.....

[Duck Butter]

I am from North Louisiana and we occasionally shot a few true Black Ducks, also known as Black Mallards. They would typically be in flocks of mallards. We do have a few small breeding populations in north La, one being Upper Oua****a NWR. I have killed mottleds in Richland Parish also. ]

I hear people down here calling mottleds Black Mallards also. Just a local thing I guess. As said above, the wing bars are a good indication if you only have a wing, but mottleds also have a little sorta black triangle in the corner of the bill that is a good indicator.

Down here, I would say 99% are mottleds, but IF it came in with mallards, you may have yourself a black duck.