Mallard Anas platyrhynchos x Common Eider Somateria mollissima hybrid
This is an unusual hybrid but it has been recorded a few times. At this location the Eider flock are unusually tame, often coming to shore to feed on bread with Mallards.
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Mallard x Common Eider hybrid, Seahouses (Northumberland, UK), 5th February 2023
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Mallard x Common Eider hybrid, Seahouses (Northumberland, UK), 9th February 2024
For comparison, here are photos of the parent species.
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Mallard and Common Eider, both Seahouses (Northumberland, UK), 5th February 2023