Created from a public domain photograph originally made by Master Sergeant Jose Lopez, Jr. of the United States Air Force:
http://commons.wikimedia.org/wiki/Image:Emperor_penguin_chicks_at_Sea_World_%C2%B7_DF-ST-90-04598.JPG
Created using Paint.NET (http://www.getpaint.net/) and Potrace (http://potrace.sourceforge.net/).
This image was donated by Pearson Scott Foresman, an educational publisher, to Wikimedia Commons, and is thereby in the Public Domain.
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See http://commons.wikimedia.org/wiki/Category:Pearson_Scott_Foresman_publisher
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