Ring-necked duck.

Ring-necked duck, Erieau, Ontario, Canada, March 17, 2019

You can actually see the ring on the female ring-necked duck. It is difficult to see on the male.
Looks like it should be called the ring-billed duck.

Aythya collaris
During fall migration, Ring-necked Ducks can form immense flocks. Several hundred thousand congregate each fall on certain lakes in Minnesota to feed on wild rice.
source - https://www.allaboutbirds.org/guide/Ring-necked_Duck/overview

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