With the blue bill, not sure what else this could be, but doesn’t correspond well to any photos/pictures I have in my books(particularly the orangish patch on the cheek). Perhaps a male coming into breeding plumage
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Canon 7DII; Sigma 150-600 at 600 mm; 1/1000 at f7.1; ISO 250
Definitely a ruddy duck, but I too wonder whether it’s starting to come into its breeding plumage. It looks a little different than the ruddys I used to shoot in the winter. Like the eye contact and the reflection. If mine, I’d clean up the water a bit.
I’d bet this Ruddy is in the middle of changing plumage. My trusty old Peterson says the non-breeding bill is dull blue or gray, this looks like it’s a deep blue about to become the bright blue of breeding season. A very nice image.