Redhead Aythya americana
An extremely rare vagrant to the UK from North America. The well-watched Nottinghamshire bird was before my photography days so here instead is a bird from captivity.
Beware when identifying potential Redheads in Europe that Pochard x Ferruginous Duck hybrids can sometimes closely resemble Redheads.
captive male Redhead, Martin Mere (Lancashire, UK), 26th December 2014