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Magnetoreception

The ability to sense a magnetic field directly - a sense humans wholly lack, even though the Earth's field is passing through your body right now. Migratory birds, sea turtles, salmon and monarch butterflies use it to navigate across thousands of kilometres. The evidence points to two distinct machines, often working together in one animal: a quantum compass in the eye (built on cryptochrome and a radical pair) that reads direction, and tiny magnetite crystals that read field strength to build a map of position.