Here are a few other resources for royalty-free photographs
Archive of many free Antarctic photograph's from the US Antarctic Program library.
This site offers a good number of pictures of all varieties for non-commercial use with very few restrictions.
While the number of pictures available is low, this site offers near restriction-free use of their photographs with registration.
U.S. Fish and
Many nature-oriented, public domain images available for download or viewing complete with picture search engine.
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