Image:NPS Wildlife. Trumpeter Swan on Nest.jpg

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NPS Photo

Source: http://www.nps.gov/yell/press/images/wildlife/

Public domain This image or media file contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website and NPS copyright policy for more information.

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