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Dacke, M., Nilsson, D. - E., Scholtz, C. H., Byrne, M., & Warrant, E. J. (2003). Animal behaviour: insect orientation to polarized moonlight. Nature, 424(6944), 33.
Abstract: Moonlight, like sunlight, scatters when it strikes tiny particles in the atmosphere, giving rise to celestial polarization patterns. Here we show that an African dung beetle, Scarabaeus zambesianus, uses the polarization of a moonlit sky to orientate itself so that it can move along a straight line. Many creatures use the Sun's light-polarization pattern to orientate themselves, but S. zambesianus is the first animal known to use the million-times dimmer polarization of moonlight for this purpose.