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Photo of the Day: Best of December 2008

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Dual tracks of light from luminous spots, one on each side of the thorax, chronicle the movements of a click beetle on a leaf in Jamaica. Unlike the hovering, twinkling firefly, Pyrophorus beetles glow for several seconds then fly like a comet. To make this image, the photographer followed a time exposure with a flash. (Photo shot on assignment for "Fireflies, Wing-Borne Lamps of the Summer Night," July 1962, National Geographic magazine) Photograph by Paul A. Zahl