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Riverbank Butterflies
Photograph by Joel Sartore
Leaf-green pierid alight on the sandy shores of the Tuichi River in Bolivia's Madidi National Park. The vast Madidi wilderness encompasses a staggering range of ecosystems—from snowcapped Andean peaks to tropical Amazonian lowlands.
(For more pictures of the amazing colors of our world, buy the National Geographic book Life in Color.)
