Gabriel Rojo / Black necked swan {Cygnus melancoryphus} Patagonia, Argentina

Gabriel Rojo / Black necked swan {Cygnus melancoryphus} Patagonia, Argentina

Tui De Roy / Black-necked Swan (Cygnus melancoryphus) group swimming, Puerto Natales, Chilean Fjords, Chile

Gabriel Rojo / Black necked swans with cygnets {Cygnus melancoryphus} Argentina

Nick Garbutt / Black-necked swan (Cygnus melancoryphus) pair in courtship on upland lake. Torres del Paine National Park, Patagonia, Chile. November 2018.

Agustin Esmoris / Black-necked Swan (Cygnus melancoryphus), Argentina

Mike Read / Black-necked swan (Cygnus melancoryphus) pair showing aggression towards other swans on the sea at Peurto Natales Patagonia, Chile. December.

Melvin Grey / Black-necked swan (Cygnus melanocoryphus) adult male, breeding plumage, portrait. Wildfowl and Wetlands Trust, Llanelli, West Wales. December.

Hermann Brehm / Black-necked swan (cygnus melancoryphus) group of three, Chile.

Chris Mattison / Black-necked swan (Cygnus melancoryphus) near Puerto Natales, Chile.

Rod Williams / Female Black-necked Swan with cygnets (Cygnus melancoryphus) captive occurs in South America.

Kevin Schafer / Black-necked Swan (Cygnus melancoryphus) pair, Patagonia, Chile