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How animals read Earth’s magnetic field

  • How animals sense Earth’s magnetic field
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    Animal magnetoreception
    Animals can use Earth’s field like a compass 🧭 Some birds, turtles, salmon, bees, and sharks do this.
  • Birds can see Earth’s magnetic fields, and now we know how that’s possible
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    Animal magnetoreception
    Birds may sense magnetism with light in the eye 👁️ A leading model says cryptochrome in the retina helps them read direction.
  • Figure 2.4 Three suggested models of the cellular signal transduction in a magnetite- based mechanism of magnetoreception. (A) The membrane-short model. An elongated magnetite particle is embedded in the cell membrane. The particle is partially isolated (black layer) and aligns within a superimposed magnetic field. Only in a certain align- ment, the particle creates an electric shortcut which leads to de- or hyperpolarization of the cell. (B) The torque-transducer model. A chain of SD-magnetite
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    Animal magnetoreception
    Other animals may use iron or induction ⚡ Some fish use electroreceptors, and some birds show clues of iron-based sensing.
  • a diagram of a diagram of a wave
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    Animal magnetoreception
    Humans may detect it, but mostly not consciously 🧠 Studies found brain responses to Earth-strength fields, yet no clear everyday magnetic sense is established.

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