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

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

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...