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Species (Cygnus columbianus) of North American swan that calls with a soft, musical note. It has a black bill, usually with a small yellow spot near the eye. It breeds in the Arctic tundra and winters in shallow fresh or salt water, especially along eastern and western U.S. coasts.
This entry comes from Encyclopædia Britannica Concise. For the full entry on whistling swan, visit Britannica.com.