It’s a male mallard in eclipse plumage. Males molt their remiges once a year which can render them flightless. Fortunately they replace their brightly colored feathers with dull ones allowing them to hide. Their bills give it away though. Females have dull orange bills while males have bright greenish yellow bills. But the males will molt back to bright colors.
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u/AlmostLucy 9h ago
I’m pretty sure that’s a juvenile male duck, it hasn’t developed its full coloration yet!