Duck hunting identification help

[g8rvet]

Any hard core duck hunters here able to give me an opinion on species?  Killed in a field in Saskatchewan.  I know what I think it is, would just like some other opinions.

Note the olive bill.  The lack of a any white on the chest, pure brown like a hen mallard.  Not a spec of green anywhere on the head, did not see a single mallard drake that did not have at least a few green spots. 

[ScottTaulbee]

Black Duck. Here's a couple I killed a few years ago for reference. We don't see many here in KY


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[Lcmacd 58]

Definitely a you g black duck

[Will]

Black duck. We kill them in Maryland

[turkey stew]

Definitely a you g black duck

wing patch is that of a mallard. Either real young mallard or possible mutant mallard/ black.