With a few exceptions the photographs, maps, diagrams and illustrations that we use on this website are either reproduced under the terms of Creative Commons licenses or are in the public domain (usually because they are the property of a government body, such as the US Fish & Wildlife Service).

Creative Commons licenses allow creators to communicate which rights they reserve, and which rights they waive for the benefit of recipients or other creators.  They do not replace copyright, but are based upon it.  The licenses consist of four major condition modules: Attribution (BY), requiring attribution to the original author; Share Alike (SA), allowing derivative works under the same or a similar license (later or jurisdiction version); Non-Commercial (NC), requiring the work is not used for commercial purposes; and No Derivative Works (ND), allowing only the original work, without derivatives.  These modules are combined to currently form six major licenses of the Creative Commons:

  • Attribution (CC BY)
  • Attribution Share Alike (CC BY-SA)
  • Attribution No Derivatives (CC BY-ND)
  • Attribution Non-Commercial (CC BY-NC)
  • Attribution Non-Commercial Share Alike (CC BY-NC-SA)
  • Attribution Non-Commercial No Derivatives (CC BY-NC-ND)

All Creative Commons licenses allow the “core right” to redistribute a work for non-commercial purposes without modification.  An additional special license-like contract is the CC0 option, or “No Rights Reserved.”  This license dedicates a work to the public domain (or an equivalent status in jurisdictions where a dedication to public domain is not possible).

We are happy to provide links to the websites of the owners of individual photographs upon request.  If you own one of the photographs on our site and would like a longer or different credit or wish to withdraw permission for its use, please get in touch with us.

Page updated 14 August 2017

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