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https://www.sciencealert.com/variatio...rve-as-stop-signs-for-migratory-birds
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https://trustmyscience.com/oiseaux-pe...couleur-que-humains-ne-percoivent-pas
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This seems to confirm that the mechanism is a visual one, based in the cryptochromes, which may be able to detect the fields because of quantum coherence.
https://www.sciencealert.com/birds-se...ields-cryptochrome-cry4-photoreceptor
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