American black duck - note greenish bill
This duck looks a lot like a mallard, don't you agree? It's certainly not "black" as it's name implies. But if you see black ducks with mallards they truly are a few shades darker brown. And this one was hanging out with mallards. (They frequently mate with them too, but their ducklings are sterile.)
The green bill is one telltale sign and the...
Note pinkish feathers
pink feathers on the wing (instead of blue) is another.
To join in the fun, visit Misty Dawn at CAMERA CRITTERS