The black-necked swan is found in the southern tier of South America. It nests from Tierra del Fuego north to central Chile, Uruguay, and Rio Grande do Sul in extreme southern Brazil. It withdraws from the southern half of Argentina in winter and is then found as far north as Brazil's São Paulo state.

An unmistakable bird with bold patterns, Black-necked swans are characteristic and majestic inhabitants of southern South Americas wetlands. They are easily distinguished by their immaculate white body feathers that contrast sharply with their velvety black head and neck.

Jul 13, 2023 · The Black-necked Swan measures 40 – 55 inches (102 – 140 cm) in length (from the top of the head to the tip of the tail) and weighs between 10 – 14.8 lbs (4.5 – 6.7 kg). The male is slighter larger than the female. Males are between 45 – 55 inches (115–140 cm) long and females between 40 – 49 inches (102–124 cm).

Black-necked swans are the small­est mem­bers of the genus Cygnus, rang­ing in length from 102 cm to 124 cm. Males range in mass from 4.5 kg to 6.7 kg, and fe­males from 3.5 to 4.4 kg.

As indicated by its name, this is a large white swan with a black neck. A red knob or carbuncle at the base of the upper mandible is enlarged in males at breeding season. The black-necked swan has short wings, but still is a fast flyer.

Nov 12, 2011 · Black-necked swans are typically very quiet birds, but during their breeding season both sexes are extremely vocal. The male swan courts the female through a series of calls and head tilts. During breeding season, the red knob at the base of the beak of the male swan becomes dark scarlet and enlarged.

Black-necked swans are the largest waterfowl native to South America but are the smallest of their genus. They are also the fastest flier of their genus reaching speeds of 50 mph. Male swans are called cobs, females are known as pens and chicks are cygnets.

The Black-necked Swans’ appearance is very much derived from its name, with black head and neck contrasting greatly with the rest of the body which is white. They have a grey spatulate bill with a pink caruncle at the base.

As the largest waterfowl native to South America, it presents a majestic figure with adults measuring between 102 to 124 cm in length and boasting a wingspan of 135 to 177 cm. Males are heavier, weighing 4.6 to 8.7 kg, while females tip the scales at a slightly lighter 3.5 to 4.4 kg.

Black-Necked swans are native to southern South America. They can also be seen on the Antarctic Peninsula. They inhabit salt water and freshwater areas, including lakes, marshes, swamps, and shielded coastal areas. Black-necked swans are known to mate for life.