“Tornado of color”. Large gatherings of butterflies are common alongside Iguaçu River (Brazil/Argentina border) When the river flow gets lower, the rocky riverbanks become exposed retaining water in small pounds, very rich in salts. This attracts butterflies of several species, mainly from Pieridae Family. Butterflies absorve and concentrate the salts in their bodies, pumping out the excess water. Photo location: Iguaçu, Paraná, Brazil. (Photo and caption by Daniel Pinheiro/National Geographic Photo Contest)
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