Photos here are copyright the National Geographic Magazine (NGM) and can only be used with written permission from both [email protected] and National Geographic Society (NGS). Valerie C. Clark was photographed at NGS headquarters in Washington D.C. on May 29, 2008 by Rebecca Hale and Mark Thiessen and appeared in NGM November 2008. Click here to see NGS copyrighted article in English or articulo en espanol.

Photos by Mark Thiessen/Becky Hale and copyright National Geographic Magazine (NGM). Use in print or online of these images is strictly prohibited without permission from NGM and Valerie Clark.

Many thanks to Sean Stewart for providing poison frogs for me to lick on camera, over and over again! Buy your own poison frogs at!

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