George Sanker / Lesser Scaup (Aythya affinis) female walking across ice. Yellowstone National Park, Wyoming, USA, June.

Claudio Contreras / Lesser Scaup Duck (Aythya affinis) swimming, Guerrero Negro, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Claudio Contreras / Lesser Scaup Duck (Aythya affinis) swimming, Guerrero Negro, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Lynn M. Stone / Lesser Scaup (Aythya affinis) drake, paddling on Choptank River, where both species winters Chesapeake Bay Eastern Shore, Maryland, USA. February.

Lynn M. Stone / Lesser scaup duck (Aythya affinis) drake, paddling on Choptank River, Chesapeake Bay Eastern Shore, Maryland, USA, February.

Donald M. Jones / Lesser Scaup (Aythya affinis) male, central Montana

Graham Eaton / Lesser Scaup (Aythya affinis) captive, Martin Mere Wildfowl and Wetlands Trust. Lancashire, UK. December.

LYNN M. STONE / Lesser Scaup duck (Aythya affinis) drake, wintering on Choptank River, Eastern Shore of Chesapeake Bay, Maryland, USA

Jan Wegener / Lesser Scaup (Aythya affinis) drake, British Columbia, Canada

Glenn Bartley / Lesser Scaup (Aythya affinis) male flying, British Columbia, Canada

Glenn Bartley / Lesser Scaup (Aythya affinis) male landing, British Columbia, Canada

Glenn Bartley / Lesser Scaup (Aythya affinis) female, British Columbia, Canada

Glenn Bartley / Lesser Scaup (Aythya affinis) female, British Columbia, Canada

Donald M. Jones / Lesser Scaup (Aythya affinis) drake landing, Fairfield, Montana

Rolf Nussbaumer / Lesser scaup duck (Athya affinis) male sleeping on water, Dinero, Lake Corpus Christi, South Texas, USA

Gerrit Vyn / Lesser scaup duck (Aythya affinis) female profile on water, King County, Washington, USA April

Gerrit Vyn / Lesser scaup duck (Aythya affinis) male profile on water, King County, Washington, USA April

David Kjaer / Lesser Scaup (Aythya affinis) first winter female on water. Gloucestershire, UK, January.

LYNN M. STONE / Lesser Scaup Duck (Aythya affinis) male on water, captive, North America

Michael Quinton / Lesser Scaup (Aythya affinis) drake in breeding plumage, Alaska

Michael Quinton / Lesser Scaup (Aythya affinis) drake in breeding plumage, Alaska

Michael Quinton / Lesser Scaup (Aythya affinis) female, Alaska

Michael Quinton / Lesser Scaup (Aythya affinis) drake in breeding plumage, Alaska

Sebastian Kennerknecht / Lesser Scaup (Aythya affinis) on pond, Baylands Nature Preserve, Bay Area, California

Donald M. Jones / Lesser Scaup (Aythya affinis) male taking off from pond, western Montana

Donald M. Jones / Lesser Scaup (Aythya affinis) male landing in pond, western Montana

Donald M. Jones / Lesser Scaup (Aythya affinis) male, western Montana

Donald M. Jones / Lesser Scaup (Aythya affinis) female, Montana

Tom Vezo / Lesser Scaup (Aythya affinis) male, North America

Tom Vezo / Lesser Scaup (Aythya affinis) flock on lake, North America

Rolf Nussbaumer / Male Lesser Scaup (Athya affinis) New Braunfels, Texas, USA. March 2001

Doug Wechsler / Lesser Scaup {Aythya affinis} female on water, New Jersey, USA

Donald M. Jones / Lesser Scaup (Aythya affinis) male landing, central Montana

Donald M. Jones / Lesser Scaup (Aythya affinis) male flying, central Montana

Donald M. Jones / Lesser Scaup (Aythya affinis) drake preening, Fairfield, Montana

Tom Vezo / Lesser Scaup (Aythya affinis) flock taking off from lake, North America

Tim Fitzharris / Lesser Scaup (Aythya affinis) male landing on lake, North America

Robin Chittenden / Lesser scaup (Aythya affinis) among group of Tufted ducks (Aythya fuligula) on water, Norfolk, England, UK. July.

Donald M. Jones / Lesser Scaup (Aythya affinis) drake flying, Montana

Daniel J. Cox / Lesser Scaup (Aythya affinis) male, Yellowstone National Park, Wyoming