“Homing pigeons don’t rely on gut instinct to return to the roost. But a nearby organ — the liver — might point the way. White blood cells in the birds’ livers accumulate iron and act as an internal compass when clouds block the sun...”
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www.sciencenews.org/article/pige...
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How animals navigate by Earth's magnetic field is hotly debated. New research in pigeons points to iron-laden liver immune cells as the compass.
