https://i2.wp.com/hughvandervoort.com/wp-content/uploads/2019/04/Black-Duck-Mallard-Hybrid-2019-2.jpg?w=1024
Furthermore there are cases where the ground coloration in the hybrids head is rather reddish,like the one linked here
In my opinion the cheeks and crown really are brown here and there is only a green iridescent patch starting behind the eye... so I think this might be a bird with a very little bit of Mottled duck or black duck ancestry a few generations in the past...
Imagine such a bird...
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