American Black Duck or Mallard?

[Viurre]

1. 

 

2. 

 

3. 

 

4. 

 

 

[The Bird Nuts]

All are Mallards (white in the tail, significant pale edging on feathers, orange tones in breast feathers).

[Viurre]

None might be hybrids?

[Sean C]

1 hour ago, The Bird Nuts said:

All are Mallards (white in the tail, significant pale edging on feathers, orange tones in breast feathers).

agreed

some might be Hybrids

[von Humboldt]

All are mallards. The ones with yellow bills are males in eclipse plumage which may be what has you thinking black duck hybrid.