This shell is so beautiful that it threatens the existence of the animal that wears it.
The candy cane snail (Liguus virgineus) is a land-based snail found on the island of Hispaniola, home of Haiti and the Dominican Republic. Because of its beauty it has been over-collected for the shell trade, making it hard to find and endangering the snail.
This particular shell is in the collection of the photographer, H. Zell, whose photo is one of the finalists for Wikimedia Common's 2013 Picture of the Year.
Voting ended yesterday but you can still view Picture Of The Year finalists here.
(photo by H. Zell, Creative Commons license at Wikimedia Commons. Click on the image to see the original)