Common Merganser ?

[Janet Tubb]

This duck was among the Mallards on Oshawa Creek in downtown Oshawa.

[Canoncan]

The way to distinguish the female Common Merganser from the Red-Breasted Merganser is the Common will have a distinct white chinstrap. It's tough to see in the photo, however it appears to be a Common

[JW Mills]

Looks like a Red-breasted to me.
Common would have a sharp contrast between neck and breast.

[Canoncan]

Like I said from this photo it is difficult to distinguish any contrast as it is swimming away

[Janet Tubb]

This photo shows the front and no sharp line between the neck and breast, so it's a Red-breasted ?

 

[Henrique Pacheco]

Yes. Red breasted.