The idea that bird orientation is guided by magnetic-sensing structures in the animals' beaks has been challenged by the suggestion that the iron-containing cells are macrophages, which have no link to the brain. See Letter p.367
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Mouritsen, H. Search for the compass needles. Nature 484, 320–321 (2012). https://doi.org/10.1038/484320a
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DOI: https://doi.org/10.1038/484320a
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