'Zebra rules': Graffiti carved into a layer of zebra mussels (Dreissena polymorpha).
André Martel © Canadian Museum of Nature / Musée canadien de la nature

This graffiti is carved into a layer of zebra mussels (Dreissena polymorpha) on a lock wall.

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This image is from a page of the Nature of the Rideau River Web site, created by the Canadian Museum of Nature. Visit the page.