Lake Duck illustration
Birdsong field guide

Lake Duck

Oxyura vittata

A small South American stiff-tailed duck known for its vibrant breeding plumage and remarkable reproductive physiology.

What it sounds like

Usually silent, but males produce low-frequency rattles and mechanical popping sounds during water-splashing displays.

Reference call, compare with what you heard
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Rec. Bernabe Lopez-Lanus · ArgentinaCC BY-NC-SAXeno-canto

Field notes

  • Possesses the longest avian penis relative to body size, which can exceed the duck's total body length.
  • Breeding males exhibit a striking cobalt-blue bill contrasted against a jet-black head and chestnut-colored body.
  • The tail consists of stiff, narrow feathers that are often held vertically while the bird is at rest or displaying.
  • Primarily a diving herbivore, it feeds on seeds, aquatic plants, and occasionally small invertebrates found in lake sediment.
  • Courtship involves elaborate 'bubbling' displays where males inflate their necks and strike their bills against their chests.
Habitat
Shallow freshwater lakes, marshes, and stagnant pools with abundant emergent vegetation.
Range
Southern South America, ranging from central Chile and Argentina to southern Brazil and Uruguay.

Similar & commonly confused birds

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