Black-necked Swan

Black-necked Swan

Summary:

Profile Black-necked Swan
[Authority] Molina, 1782 | [group] Ducks, geese and swans | [order] ANSERIFORMES | [family] Anatidae | [latin] Cygnus melancoryphus | [UK] Black-necked Swan |

[Authority] Molina, 1782 | [group] Ducks, geese and swans | [order] ANSERIFORMES | [family] Anatidae | [latin] Cygnus melancoryphus | [UK] Black-necked Swan | [FR] Cygne a cou noir | [DE] Schwarzhals-Schwan | [ES] Cisne Cuellinegro | [NL] Zwarthalszwaan | copyright picture Jan Dolphijn

copyright: Anna Motis

Large solid white body with a long, velvety black neck and a white stripe across the eye. The bill is grey with a large, flesh-pink knob at the base. The legs and feet are also pink. Female is the same as the male, only slightly smaller.

This bird inhabits mostly costal areas, as well as inland lakes. Black-necked swans can be found in both marine and freshwater areas with an abundance of vegetation.

The black-necked swan has a fairly stable population and is common in many areas of its range. They are hunted for their down which is used for clothing and cold weather bedding. Although the demand is decreasing, these swans are also hunted for food. Habitat loss, including draining of many marsh and wetland areas, continues to be the largest threat to this species.

They submerge their head and neck while feeding on choice aquatic vegetation. Their bills have serrated edges that filter out small food items from the water. Their rough tongue aids with the grasping and tearing of plants. Due to their long necks, they can feed on pond bottoms. Diet consits of Aquatic vegetation, including stone warts, pond weeds and algae, insects, small invertebrates and fish spawn


This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence 30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern. [conservation status from birdlife.org]


Black-necked swans mate for life, becoming very territorial and aggressive during nesting. These swans, which are normally very social, become very defensive and will pursue any intruder that ventures near their nest, attempting to bite or beat them with their wings. 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. The breeding season lasts from July to September with females laying four to six eggs at a time, up to three times a season. The female swan, known as a pen, is the only one who can sit on the eggs, while the male protects the nest and brings her food. After around 36 days the eggs hatch and the cygnets are dependent on their parents for their first year of life, fledging after a period of about 90 days. Black-necked swans are unique in that both of the parents carry their young on their back continuously for the first three weeks of life. This bird molts once a year, males and females at different times. The female swan becomes flightless soon after breeding, spending her time incubating the eggs. The males molt only after the female is finished. The swans do this at different times so that one of the parents is always ready to defend their young.

They tend to reside in large flocks (up to 5,000 birds) during the non-breeding season, but when breeding they split into highly territorial pairs. During non-breeding months, many of these swans can be found in Uruguay and southern Brazil. The breeding season initiates a migration south to areas such as Patagonia and the Falkland Islands.

Specification

  1. Measurements
  2. spanwidth min.: 170 cm
  3. spanwidth max.: 180 cm
  4. size min.: 102 cm
  5. size max.: 124 cm
  6. Breeding
  7. incubation min.: 34 days
  8. incubation max.: 38 days
  9. fledging min.: 80 days
  10. fledging max.: 100 days
  11. broods 1
  12. eggs min.: 4
  13. eggs max.: 8
  14. Conservation Status
  15. Black-necked Swan status Least Concern
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