Quick reference to the Black-necked Swan (Cygnus melancoryphus) in the Birds.
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Black-necked Swan
Cygnus melancoryphus
Quick Reference

Black-necked Swan (Cygnus melancoryphus)
Black-necked Swan (Cygnus melancoryphus),
mother with cygnets under her wings.

Quick Reference on the Black-necked Swan (Cygnus melancoryphus)

Black-necked Swan: Scientific name: Cygnus melancoryphus
Registered by Molina in 1792.
No subspecies recognized.
Distribution: South America: from Brazil to Tierra del Fuego.
Movements: Some populations are migratory, others are sedentary.
Flight: Strong, capable of long journeys.
Status: Common.
Habitat: Freshwater lakes and large ponds, brackish water, and sea coast.
Behavior: Sociable when not nesting. Territorial during nesting.
Nesting: Small colonies well spread out, or solitary.
Usually once a year.
Season: Southern spring.
Nest: Among the grass next to lakes.
Clutch: From three to seven eggs.
Eggs: Cream color.
Length: from 93 to 109 by from 63 to 69.3 mm - average 101 X 66 mm.
Weight: from 173 to 274 grams - average 247 grams.
Incubation: 34 to 36 days. Done by the female.
Cygnets: Born with white feathers.
Next day after birth weight from 129 to 184 grams.
Adulthood: From three to four years of age.
Food: Aquatic plants. Possibly complemented with small invertebrates and other small animals.
Description: Sexes are alike except for males are bigger. Usually red thickening on beak grows larger on males.
Dimensions: Length from 102 to 124 cm. (40 to 49 inches).
Weight: Male: 4.5 to 6.7 Kg.
Female: 3.5 to 4.4 Kg.
Tarsus: Male: 85 to 88 mm.
Female: 78 to 80 mm.
Wing: Male: 435 to 450 mm.
Female: 400 to 415 mm.
Head: Small in proportion to the body. Covered with feathers.
Bill: Very dark gray.
Medium size in proportion to the head.
Males: 82 to 86 mm. Females: 71 to 73 mm.
Wide and flattened. Nostrils at the middle.
A red thickening (or knob) grows on top of base.
Neck: Long. Covered with feathers.
Legs: Short. Pink on adults. Gray on juveniles.
Feet: Pink on adults. Gray on juveniles.
Molt: Once a year.
Life Span: In captivity estimated seven years, some have exceeded twenty years.
Other names:
Spanish: “Cisne de Cuello Negro”
Portuguese: “cisne-de-pescoço-preto”

Black-necked Swan (Cygnus melancoryphus)
Black-necked Swan (Cygnus melancoryphus),
pair nesting in captivity.

More information on the Black-necked Swan (Cygnus melancoryphus):
| Taxonomy | Bibliography |
| Links en: | English | Spanish |

| Swans | Anatidae | Anseriformes |
| Birds of Flight | Birds |
| Zoo | Damisela |


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Last revision: February 1, 2007
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