What on earth is this?

It must be some sort of hybrid, but who its parents are I have no idea!! It was twice the size of even a large mallard and had a mate with much the same size and colouring but without the feather cap! It was living happily alongside mallards, hybrids, moorhens, coots and gulls on a reed-fringed pond alongside the coast in Anglesey. His cap really was feather - at first glance I thought it was a fungus!!

 

Cheers, Linda.

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