||Scientific name: Cygnus melancoryphus|
Registered by Molina in 1792.
No subspecies recognized.
||South America: from Brazil to Tierra del Fuego.|
||Some populations are migratory, others are sedentary.|
||Strong, capable of long journeys.|
||Freshwater lakes and large ponds, brackish water, and sea coast.|
||Sociable when not nesting. Territorial during nesting.|
||Small colonies well spread out, or solitary.|
Usually once a year.
||Among the grass next to lakes.|
||From three to seven eggs.|
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.
||34 to 36 days. Done by the female.|
||Born with white feathers.|
Next day after birth weight from 129 to 184 grams.
||From three to four years of age.|
||Aquatic plants. Possibly complemented with small invertebrates and other small animals.|
||Sexes are alike except for males are bigger. Usually red thickening on beak grows larger on males.|
||Length from 102 to 124 cm. (40 to 49 inches).|
||Male: 4.5 to 6.7 Kg.|
Female: 3.5 to 4.4 Kg.
||Male: 85 to 88 mm.|
Female: 78 to 80 mm.
||Male: 435 to 450 mm.|
Female: 400 to 415 mm.
||Small in proportion to the body. Covered with feathers.|
||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.
||Long. Covered with feathers.|
||Short. Pink on adults. Gray on juveniles.|
||Pink on adults. Gray on juveniles.|
||Once a year.|
||In captivity estimated seven years, some have exceeded twenty years.|
|Spanish: ||“Cisne de Cuello Negro”|