From en wikipedia http://en.wikipedia.org/wiki/Image:Banana_slug.jpg

Photo of a banana slug Ariolimax

From the National Park Service website:

Ownership

Information presented on this website, unless otherwise indicated , is considered in the public domain. It may may be distributed or copied as is permitted by the law. Not all information on this website has been created or is owned by the NPS. If you wish to use any non-NPS material, you must seek permission directly from the owning (or holding) sources. NPS shall have the unlimited right to use for any purpose, free of any charge, all information submitted to NPS via this site except those submissions made under separate legal contract. NPS shall be free to use, for any purpose, any ideas, concepts, or techniques contained in information provided to NPS through this site.

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