This work has been released into the public domain by its author, Jon Sullivan. This applies worldwide. In some countries this may not be legally possible; if so: Jon Sullivan grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
(I am using this photo of a heron for an environmental example, borrowed from this site as a public domain photo: http://www.public-domain-photos.com/animals/bird-7-4.htm)
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