Many migratory birds and other animals are able to detect magnetism and use it as a navigation aid, but how they do this is not certain. Michael Walker is a New Zealander who has researched this question, investigating deposits of the iron-rich mineral magnetite in the brains of pigeons, bees, trout, tuna, stingrays and other animals.
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New Zealand Herald
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13 November 2003 (NZH-1001663)
Photograph by Paul Estcourt
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