Alan Murphy / Green-winged Teal (Anas carolinensis) male calling, Texas

Alan Murphy / Green-winged Teal (Anas carolinensis) male, Texas

Oscar Dewhurst / Yellow-billed teal (Anas flavirostris) swimming in Andean lake. Arequipa, Peru. September

Oscar Dewhurst / Yellow-billed teal (Anas flavirostris) perched on rock in river. Arequipa, Peru. September. Cropped

Mike Potts / Speckled Teal (Anas flavirostris) Saunders Island. Falkland Islands. January

Mike Potts / Speckled teal (Anas flavirostris) in stream, Saunders Island. Falkland Islands. January

Mike Potts / Speckled teal (Anas flavirostris) in stream, Saunders Island. Falkland Islands. January

Mike Potts / Speckled teal (Anas flavirostris) in stream, Saunders Island. Falkland Islands. January

Mike Read / Speckled teal (Anas flavirostris) pair with four ducklings on a pond Saunders Island, Falkland Islands. November 2016

Alan Murphy/ BIA / Green-winged Teal (Anas carolinensis) male, Texas

Mike Read / Speckled teal (Anas flavirostris) resting on pond. Sea Lion Island. Falkland Islands. November.

Mike Read / Speckled teal (Anas flavirostris) pair resting on grassland, Bleaker Island, Falkland Islands November

Gabriel Rojo / Yellow-billed teal (Anas flavirostris) two swimming, La Pampa, Argentina

Ole Jorgen Liodden / Green-winged teal (Anas carolinensis) in swimming, Ostensjovannet, Oslo, Norway, June.

Alan Murphy / Green-winged Teal (Anas carolinensis) male, Texas

Alan Murphy / Green-winged Teal (Anas carolinensis) male, Texas

Alan Murphy / Green-winged Teal (Anas carolinensis) males greeting, Texas

Alan Murphy / Green-winged Teal (Anas carolinensis) female, Texas

Tim Laman / Speckled teal (Anas flavirostris) on rock, Carcass Island, Falkland Islands.

Alan Murphy / Green-winged Teal (Anas carolinensis) male, Texas

Connor Stefanison / Green-winged Teal (Anas carolinensis) female, British Columbia, Canada

Hanne & Jens Eriksen / Female Green winged teal (Anas carolinensis) on water, Texas, USA, January

Doug Wechsler / Mixed flock of duck (Mallard, Green-winged teal, Pintail, Widgeon) flying over sorghum field, Floyd County, Texas, USA

Donald M. Jones / Green-winged Teal (Anas carolinensis) male, western Montana

Donald M. Jones / Green-winged Teal (Anas carolinensis) male on lake, western Montana

Rolf Nussbaumer / Green winged Teal {Anas carolinensis} male, Texas, USA, April

Rolf Nussbaumer / Male Green winged teal asleep with head tucked under wing, Texas, USA. {Anas carolinensis}

Tom Vezo / Green-winged Teal (Anas carolinensis) male, British Columbia, Canada

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.

Bruce Thomson / Speckled teal duck (Anas flavirostris) at water's edge, Buenos Aires, Argentina.

Jussi Murtosaari / Green-winged teal (Anas crecca) pair on water. Tervatehdas, Finland. April.