Gegear et al. studied the ability of fruitflies to detect a magnetic field. a, When trained to associate a magnetic field with a reward of sugar, wild-type flies preferentially choose to enter a tube that is bathed in a magnetic field, rather than one that is not, so long as blue light illuminates the experiment. b, The trained flies demonstrate no preference for the tubes if blue light is filtered out of the illumination. c, Genetically modified flies that lack the photoreceptor cryptochrome (which responds to blue light) do not recognize the magnetic field, even in the presence of blue light, showing that cryptochrome is essential for magnetoreception in fruitflies.
From Nature.
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