Special thanks to all my references!

Animal Diversity Web 2007. <URL:
    http://animaldiversity.ummz.umich.edu/site/accounts/information/Cygnus_melancoryphus.html>.
    Accessed 2 April 2009.

Austin, O. 1961. Birds of the world. Golden Press Inc. New York, New York, USA.

Corti, P and R.P. Schlatter. 2000. Feeding ecology of the black-necked swan Cygnus
    melancoryphus
in two wetlands of southern chile. Studies on Neotropical Fauna and
    Environment 37 <URL: http://libweb.uwlax.edu:2950/ehost/pdf?vid=2&hid=3&sid=e7c5a01e-
    36fc-4f7b-8c13-cd615ae0103a%40sessionmgr2
>. Accessed 5 April 2009.

Podulka, S; Rohrbaugh, R and Bonney R. ed. 2004. Handbook of bird biology. Cornell Lab of
    Orinthology. Ithaca, New York, USA.

Sibley, C. and B. Monroe. 1990. Distribution and taxonomy of birds of the world. Yale University
    Press. New Haven, Connecticut, USA.

Skutch, A. 1976. Parent birds and their young. University of Texas Press. Austin, Texas, USA.

St. Louis Zoo 2003. <URL:
    http://www.stlzoo.org/animals/abouttheanimals/birds/waterfowl/blackneckedswan.htm>.
    Accessed 5 April 2009.

Todd, F. 1996. Natural history of the waterfowl. Ibis Publishing Company. Vista, California, USA.

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