Aythya sp. at Vange Marsh (RSPB).
Aythya Hybrid, possibly Tufted Duck x Pochard, Vange Marsh 15/06/04, 15/06/2004
(© Steve Arlow, Nikon Coolpix 995 with Kowa TSN824 scope)

Aythya sp. at West Canvey Marsh (RSPB).
Aythya hybrid poor record shot West Canvey Marsh, 10/02/2015
(© Vince Kinsler, Canon 7D)

Aythya sp. at West Canvey Marsh (RSPB), 17/02/2016
(© Richard Howard, Panasonic LUMIX DMC-FZ72)

Aythya sp. at West Canvey Marsh (RSPB), 17/02/2016
(© Richard Howard, Panasonic LUMIX DMC-FZ72)

Aythya sp. at West Canvey Marsh (RSPB), 04/03/2016
(© Richard Howard, Panasonic LUMIX DMC-FZ72)

Aythya sp. at West Canvey Marsh (RSPB), 04/03/2016
(© Richard Howard, Panasonic LUMIX DMC-FZ72)

Aythya sp. at West Canvey Marsh (RSPB).
giving size comparison with Wigeon, 04/03/2016
(© Richard Howard, Nikon D300S; AF-S NIKKOR 300mm ED)

Aythya sp. at West Canvey Marsh (RSPB).
immature Scaup hybrid, 19/11/2016
(© Richard Howard, Nikon D7200; Nikkor 200-500 5.6ED tele)

Aythya sp. at West Canvey Marsh (RSPB).
adult female Scaup hybrid, 19/11/2016
(© Richard Howard, Nikon D7200; Nikkor 200-500 5.6ED tele)

Aythya sp. at West Canvey Marsh (RSPB).
adult female Scaup hybrid, 19/11/2016
(© Richard Howard, Nikon D7200; Nikkor 200-500 5.6ED tele)

Aythya sp. at West Canvey Marsh (RSPB).
female Scaup hybrid, 24/11/2016
(© Richard Howard, Nikon D7200; Nikkor 200-500 5.6ED tele)

Aythya sp. at Bowers Marsh (RSPB).
Scaup?, 14/12/2017
(© Graham Oakes, )