”Devils Hole” (på engelska). U.S. National Park Service. 28 maj 2010. http://www.nps.gov/deva/naturescience/devils-hole.htm. Läst 22 mars 2012. ”Although pupfish have been found as deep as 66 feet (20 m), the fish forage and spawn exclusively on a shallow rock shelf near the surface, feeding on the algae and diatoms found there.”
