Whooper Swan is identified by the extensive yellow on the forward part of the face. It is a Eurasian species most often seen in North America in the Aleutians. The particular individual here is for reference and is not ABA countable.
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Whooper Swan on nest
Livingston Ripley Conservancy, Litchfield, CT
June 4, 2014©John Schwarz
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Whooper Swan (note extensive yellow on face)
Livingston Ripley Conservancy, Litchfield, CT
June 4, 2014©John Schwarz