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Ecologists have long debated why moths are drawn to streetlights, since the behaviour offers no obvious —evolutionaryevolvingevolutionevolutionist advantage. One influential theory holds that artificial lights —mimicresemble each otherimitate forcopy from the moon, which moths use to fly in a straight line. Because the light source is so much —closerclosenearer tomost close, the insects continually adjust their angle and become —trappedtrappingentrapped bytrap circling it.