The ability to perceive Earth's magnetic field, which at one time was dismissed as a physical impossibility, is now known to exist in diverse animals. The receptors for the magnetic sense remain elusive. But it seems that at least two underlying mechanisms exist — sometimes in the same organism.
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Lohmann, K. Magnetic-field perception. Nature 464, 1140–1142 (2010). https://doi.org/10.1038/4641140a
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DOI: https://doi.org/10.1038/4641140a