I'm thinking the one that's different is a mallard. Just can't figure out what the other two are. Their feet are black with a little pink.
Edited by Courthamilton - 4/26/16 at 6:54pm
The two that look alike look like Magpies! My favorite breed of duck! I really think the other is a rouen or mallard!
They look to be pekins and honestly with ducks you either have to wait for the quack or wait until they are full grown at about 5-6 months to tell the gender, but guessing doesn't hurt :).
Im going to agree with the rouen statement it is much to big to be a mallard duckling at this age.
The other 2 look to be magpies.
I really think their magpies. I've never seen an ancona with such uniformed coloring in the places magpies have coloring.