Black-necked Swan
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Cygnus melancoryphus
Native of South America.
Adults plumage are white and the neck and head black; the latter usually has a white stripe behind the eye.
They have a prominent red knob at the base of their bill.
Juveniles are grayish rather than white and lack the knob until their third or fourth year.
The call is a soft, musical 'Whee-whee-whee' with the accent on the initial syllable",
In flight, they are smaller than the European Swans.