David Tipling / Blue-winged teal (Anas discors) male, Viera Wetlands, Florida, USA. March.

Alan Murphy/ BIA / Blue-winged Teal (Anas discors) males flying, Texas

Ingo Arndt / Aerial view of Blue-winged teal (Anas discors) flock flying with Great Blue Heron (Ardea herodias) on the ground, Everglades National Park, Florida, USA, January.

Ingo Arndt / Blue-winged teal (Anas discors) aerial of flock flying, Everglades National Park, Florida, USA, January 2015.

Ingo Arndt / Blue-winged Teal (Anas discors) flock taking flight, aerial, Everglades National Park, Florida, USA, January.

Ingo Arndt / Blue-winged Teal (Anas discors) flock swimming, aerial, Everglades National Park, Florida, USA, January.

Roger Powell / Blue-winged teal (Anas discors) male on water, La Chua Trail, Payne Priarie Reseve, Gainsville, Florida, USA, April

Roger Powell / Blue-winged teal (Anas discors) male escorting female while feeding, La Chua Trail, Payne Priarie Reseve, Gainsville, Florida, USA, April

Alan Murphy/ BIA / Blue-winged Teal (Anas discors) male, Texas

Claudio Contreras / Blue-winged teal (Anas discors) male, Xochimilco wetlands, Mexico City, March

Claudio Contreras / Blue-winged Teal (Anas discors) male, Xochimilco wetlands, Mexico City, March

Claudio Contreras / Cinnammon teal (Spatula cyanoptera septentrionalium) male and two Blue-winged teal (Anas discors) males, Xochimilco wetlands, Mexico City, March

Claudio Contreras / Blue-winged teal (Anas discors) pair, Xochimilco wetlands, Mexico City, February

Claudio Contreras / Blue-winged teal (Anas discors) group of four males and three females, Xochimilco wetlands, Mexico City, March

Claudio Contreras / Blue-winged teal (Anas discors) male swimming on rippled waters, Xochimilco wetlands, Mexico City, February

Matthew Studebaker / Blue-winged Teal (Anas discors) male, Ohio

Christine Jung / Blue-winged Teal (Anas discors) flock flying, Florida

Alan Murphy / Blue-winged Teal (Anas discors) male, Texas

Marie Read / Blue-winged Teal (Anas discors) pair perched on floating vegetation, male stretching its wing and leg, Merritt Island National Wildlife Refuge, Florida, USA. March

Marie Read / Blue-winged Teal (Anas discors) pair perched on floating vegetation, male (right) shaking after preening, Merritt Island National Wildlife Refuge, Florida, USA, March.

LYNN M. STONE / Blue-Winged Teal (Anas discors) drake, on water. Lakeland, Florida, USA, January.

LYNN M. STONE / Blue-Winged Teal (Anas discors) drake, dipping for food in pond. Lakeland, Florida, USA, January.

Rod Williams / Male Blue-winged Teal (Anas discors). Captive. Endemic to North America. UK, March.

Steve Gettle / Blue-winged Teal (Anas discors) males, J. Clark Salyer National Wildlife Refuge, North Dakota

Steve Gettle / Blue-winged Teal (Anas discors) male and female, J. Clark Salyer National Wildlife Refuge, North Dakota

Steve Gettle / Blue-winged Teal (Anas discors) male, J. Clark Salyer National Wildlife Refuge, North Dakota

Barry Mansell / Blue-winged Teal (Anas discors) calling. Everglades National Park, South Florida, USA, March.

Barry Mansell / Blue-winged Teal (Anas discors) male (left) and female on water. Canaveral National Seashore, Florida, USA, January.

Scott Leslie / Blue-winged Teal (Anas discors) male in spring, Nova Scotia, Canada

Scott Leslie / Blue-winged Teal (Anas discors), Belleisle Marsh, Nova Scotia, Canada

Scott Leslie / Blue-winged Teal (Anas discors) female standing in pond, Annapolis Royal, Nova Scotia, Canada

Scott Leslie / Blue-winged Teal (Anas discors) female standing in pond, Annapolis Royal, Nova Scotia, Canada

George McCarthy / Male and female Blue-winged Teal (Anas discors) on water, Arkansas Refuge, Texas, USA

Rolf Nussbaumer / Male-female pair of Blue-winged Teal (Anas discors) Willacy County, Rio Grande Valley, Texas, USA. May 2004

Rolf Nussbaumer / Male Blue-winged Teal (Anas discors) preening, Port Aransas, Texas, USA. February 2003

Shattil & Rozinski / Blue winged teal {Anas discors} Texas, USA

Tom Vezo / Blue winged Teal duck {Anas discors} on water, Florida, USA.

WILLIAM OSBORN / Portrait of Male Blue winged teal (Anas discors) resting, UK, C, notice the leg rings where bird has been tagged for research purposes

Rolf Nussbaumer / Blue winged teal {Anas discors} male, Welder Wildlife Refuge, Sinton, Texas, USA.

Flip de Nooyer / Blue-winged Teal (Anas discors) males on lake, North America

Rolf Nussbaumer / Blue winged teal male on water {Anas discors} Texas, USA

Tim Fitzharris / Blue-winged Teal (Anas discors) male taking off from lake, North America

Tim Fitzharris / Blue-winged Teal (Anas discors) on water, North America

Jim Brandenburg / Blue-winged Teal (Anas discors) male and female, Minnesota

Gerry Ellis / Blue-winged Teal (Anas discors) eggs in nest, Malheur National Wildlife Refuge, Oregon

Scott Leslie / Blue-winged Teal (Anas discors) male and female at nest, Nova Scotia, Canada

Scott Leslie / Blue-winged Teal (Anas discors) male, Nova Scotia, Canada

Barry Mansell / Blue-winged Teal (Anas discors) Meritt Island, Florida, USA

Marie Read / Green-winged teal (Anas crecca) male, in flight over a marshland pool, Alaska, USA. May.

Marie Read / Green-winged teal (Anas crecca) male, in flight over a marshland pool, Alaska, USA. May.

Doug Gimesy / Coalition Against Duck Shooting (CADS) protestor holding a dead Grey teal duck (Anas gracilis). As part of an annual protest against Victoria's duck season, rows of illegally shot threatened species,...

Doug Gimesy / As part of an annual protest against Victoria's duck season, rows of illegally shot threatened species, protected species, as well as game species that duck shooters left dead or dying in the water ar...

Doug Gimesy / As part of an annual protest against Victoria's duck season, rows of illegally shot threatened species, protected species, as well as game species that duck shooters left dead or dying in the water ar...

Barry Mansell / Blue-winged teal(Anas discors) male and female Sweetwatee Refuge, Bainesville, Florida, USA, December.

Barry Mansell / Blue -winged teal (Anas discors) male, Sweetwater Refuge, Bainesville, Florida, USA, December.