White-headed Duck Oxyura leucocephala

Found naturally in the Mediterranean region and western Asia but there are many captive birds in wildfowl collections elsewhere. The only birds I've seen in the wild were at Abberton (Essex) and Hardley Flood (Norfolk) which may have involved wild vagrants from their natural range or escapees from captivity. I didn't get photos of either, so below are some birds in captivity.

captive White-winged Ducks, Pensthorpe (Norfolk, UK), 9th March 2014

captive White-winged Duck, Pensthorpe (Norfolk, UK), 5th February 2022

captive White-winged Duck, Martin Mere (Lancashire, UK), 26th December 2014

captive White-winged Ducks, Martin Mere (Lancashire, UK), 28th December 2003