The sunset, here viewed from Saguaro East, marked the end of the 2011 BioBlitz in Saguaro National Park. In 2012, National Geographic will help conduct a species inventory in entirely different ecosystems—at Rocky Mountain National Park, outside Boulder, Colorado.

Photograph by Kimberly Dumke, National Geographic

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Saguaro National Park BioBlitz
Saguaro National Park BioBlitz Article

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National Geographic partners with the National Park Service to inventory species in America's national parks, with the help of students, scientists, and the public. In 2011, the team took to Tucson, Arizona to count organisms large and small in Saguaro National Park.