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Lake Duck - BirdForum Opus

Alternative names: Argentina Duck, Blue-billed Duck

Oxyura vittata


36–46 cm (14¼-18 inches)

  • Black head
  • Reddish-brown body
  • Blue bill

Female has a brown body, white throat, and a white horizontal stripe on the side of the head below the eyes.

Similar Species

Photo by Luis R
Batuco Wetland, Santiago, Chile, August 2016

The male is rather like the male Ruddy Duck, but has a smaller, flatter head and longer tail.


South America: found in southern Argentina and Chile; winters north to southern Brazil and Paraguay.


This is a monotypic species[1].


Large freshwater shallow lakes, marshes and small pools; favouring those bordered by abundant vegetation.



There is little information available. They feed by diving and are thought to eat seeds, plant material and small aquatic creatures.


Ducks are one of very few groups of birds that uses a penis for transferring semen to the female. It has been described that Lake Duck has an unusually long penis for the body size. They appear to be monogamous.


  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2016. The eBird/Clements checklist of birds of the world: v2016, with updates to August 2016. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Everything2.com
  3. Handbook of the Birds of the World Alive (retrieved October 2016)

Recommended Citation

External Links

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