Iron crystals in their beaks give birds a nose for north.
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MoraC. V., DavisonC. V., WildJ. M. & WalkerM. M. Nature, 432. 508 - 511 (2004).
University of North CarolinaUniversity of North Carolina
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Hopkin, M. Homing pigeons reveal true magnetism. Nature (2004). https://doi.org/10.1038/news041122-7