Gabriel Rojo / White cheeked pintail duck {Anas bahamensis} La Pampa, Argentina

Lucas Bustamante / White-cheeked pintail (Anas bahamensis galapagensis) resting, Santa Cruz Island, Galapagos.

Gabriel Rojo / White-cheeked pintail (Anas bahamensis) in flight, La Pampa, Patagonia, Argentina

Tui De Roy / White cheeked pintail duck (Anas bahamensis) female with chick, Galapagos

Steve Gettle / White-cheeked Pintail (Anas bahamensis), Galapagos Islands, Ecuador

Gabriel Rojo / White-cheeked pintail, (Anas bahamensis) two in flight, La Pampa, Argentina

Gabriel Rojo / White-cheeked pintail (Anas bahamensis) two resting by water, La Pampa, Argentina

Tui De Roy / White cheeked pintail (Anas bahamensis) chicks at waters edge, Galapagos

Tui De Roy / White-cheeked Pintail (Anas bahamensis) and chick, Academy Bay, Santa Cruz Island, Ecuador

Glenn Bartley / White-cheeked Pintail (Anas bahamensis), British Columbia, Canada

Glenn Bartley / White-cheeked Pintail (Anas bahamensis), British Columbia, Canada

Daniel Heuclin / White-cheeked Pintail (Anas bahamensis) Bolivia, August

Mike Wilkes / White-cheeked Pintail (Anas bahamensis) standing in water. Floreana, Galapagos Islands.

Tui De Roy / White-cheeked pintails (Anas bahamensis) on water, male in foreground with red beak. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) male on water. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) drinking water. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) male on water. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) male on water. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) filtering water through beak - male. Galapagos Islands, Educaor, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) male on water. Galapagos Islands, Ecuador, June.

Tui De Roy / White-cheeked pintail (Anas bahamensis) resting with beak in plumage. Galapagos Islands, Ecuador, November.

Tui De Roy / White-cheeked Pintail (Anas bahamensis), Galapagos Islands, Ecuador

Tui De Roy / White-cheeked Pintail (Anas bahamensis), Galapagos Islands, Ecuador

Tui De Roy / White-cheeked Pintail (Anas bahamensis) in salt lagoon, Galapagos Islands, Ecuador

Graham Eaton / White-cheeked / Bahama pintail (Anas bahamensis) drake displaying, captive, Martin Mere WWT, Lancashire, UK, December

Graham Eaton / White-cheeked / Bahama pintail (Anas bahamensis) captive, Martin Mere WWT, Lancashire, UK, December

David Kjaer / White-cheeked pintail (Anas bahamensis) captive, from Galapagos Islands, West Indies and South America

Tim Laman / White-cheeked pintail (Anas bahamaensis), Santa Cruz Island, Galapagos Islands.

Tim Laman / White-cheeked pintail (Anas bahamaensis) preening, Santa Cruz Island, Galapagos Islands.

Pete Oxford / White cheeked pintail duck (Anas bahamensis) on hotel swimming pool, Santa Cruz Is, Galapagos

Pete Oxford / White-cheeked pintail {Anas bahamensis} in hotel swimming pool, Santa Cruz Island, Galapagos Islands.

Rod Williams / Silver pintail, white mutation of White cheeked pintail {Anas bahamensis} captive

Tui De Roy / White-cheeked Pintail (Anas bahamensis) male in salt lagoon, Rabida Island, Galapagos Islands, Ecuador

DAVID TIPLING / White cheeked pintail {Anas bahamensis} captive, UK

Tui De Roy / White-cheeked Pintail (Anas bahamensis) ducks on mineral lake in June 1975 prior to lake being destroyed by eruptions, Fernandina Caldera, Fernandina Island, Galapagos Islands, Ecuador

Tony Heald / White cheeked pintail ducks {Anas bahamensis} Galapagos.Islands

Gabriel Rojo / White cheeked pintail {Anas bahamensis} La Pampa, Macachin, Argentina, South America

Agustin Esmoris / White-cheeked Pintail (Anas bahamensis), Argentina

Barry Mansell / White-cheeked pintail (Anas bahamensis) portrait on water, captive

Gabriel Rojo / White cheeked pintail {Anas bahamensis} Cinnamon teal {A cyanoptera} Argentina Macachin

Joel Sartore / Photo Ark / Greater Bahama pintail (Anas bahamensis rubrirostris) portrait, Parque Zoologico Huachipa, Peru. Captive.

Joel Sartore / Photo Ark / Greater Bahama pintail (Anas bahamensis rubrirostris) head portrait, Parque Zoologico Huachipa, Peru. Captive.

Joel Sartore / Photo Ark / Greater Bahama pintail (Anas bahamensis rubrirostris) portrait, Parque Zoologico Huachipa, Peru. Captive.

Joel Sartore / Photo Ark / Greater Bahama pintail (Anas bahamensis rubrirostris) portrait, Parque Zoologico Huachipa, Peru. Captive.

Tui De Roy / Pair of White-cheeked pintails (Anas bahamensis galapagensis), distinct subspecies, filter feeding through pond, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador.

David Fleetham / Galapagos white-cheeked pintail (Anas bahamensis galapagensis), adult, endemic subspecies only found on Galapagos islands where it is resident year round, in muddy pond on Santa Cruz Island, Galapagos...

Roland Seitre / White-cheeked Pintail (Anas bahamensis), native to South America

Roland Seitre / White-cheeked Pintail (Anas bahamensis), native to South America

Tui De Roy / Greater Flamingo (Phoenicopterus ruber) and White-cheeked Pintail (Anas bahamensis) foraging, Punta Cormorant, Floreana Island, Galapagos Islands, Ecuador

Tui De Roy / Greater Flamingo (Phoenicopterus ruber) and White-cheeked Pintails (Anas bahamensis) foraging, Punta Cormorant, Floreana Island, Galapagos Islands, Ecuador

Tui De Roy / American flamingo (Phoenicopterus ruber) feeding in saline lagoon, with White-cheeked pintails (Anas bahamensis), Floreana Island, Galapagos Islands.

Tui De Roy / American flamingo (Phoenicopterus ruber) feeding in saline lagoon, with White-cheeked pintails (Anas bahamensis), Floreana Island, Galapagos Islands.

Tui De Roy / American flamingos (Phoenicopterus ruber) feeding in saline lagoon, with White-cheeked pintails (Anas bahamensis), Floreana Island, Galapagos Islands.

Tui De Roy / American flamingo (Phoenicopterus ruber) feeding in saline lagoon, with White-cheeked pintails (Anas bahamensis), Floreana Island, Galapagos Islands.

Tui De Roy / White-cheeked pintails (Anas bahamensis) with Western Santa Cruz tortoise (Chelonoidis porteri) at pond, Santa Cruz, Galapagos.

Tui De Roy / White-cheeked pintail (Anas bahamensis) flock on water, Fernandina Island, Galapagos,