BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Atacama petroglyphs. Close-up of moonlit prehistoric rock carvings (petroglyphs) on a rock-face in the Rainbow Valley (Valle Arcoiris), Atacama Desert, Chile, at night. These carvings show two juvenile llamas (foreground) and adult llamas on the rocks above.
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