Photo of the Day

butterflies in flight along the Iguazu River
December 19, 2013

Aflutter Along the Iguazu

This Month in Photo of the Day: National Geographic Photo Contest Images Large gatherings of butterflies are common alongside the Iguazu River on the Brazil-Argentina border. When the river flow gets lower, the rocky riverbanks become exposed, retaining water in small ponds very rich in salts. This attracts butterflies of several species, mainly of the Pieridae family. Butterflies absorb and concentrate the salts in their bodies, pumping out the excess water. (This photo and caption were submitted to the 2013 National Geographic Photo Contest.) See all contest entries » Browse galleries of our editors' favorites »
Photograph by Daniel Pinheiro

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