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For the first time, researchers have been able to prove that city lights limit the ability of nocturnal animals to navigate by natural light in the night sky. Instead, they are forced to use streetlamps, neon light or floodlights to orient themselves. The findings are published in
Current Biology.
Some animals, including migratory birds, seals and moths, use light from the moon, stars and Milky Way to navigate at night. A team of researchers at Lund University in Sweden and the University of the Witwatersrand in South Africa have now shown how nocturnal dung beetles are forced to search for cues in their immediate surroundings when they can no longer navigate using natural light from the night sky.

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