Quantum theory: the weird world of teleportation, tardigrades and entanglement

... entanglement also may enable pigeons and robins to navigate. These birds detect the Earth’s magnetic field, apparently due to quantum entanglement in their eyes. Light coming into the eye boosts the energy of electrons. A property of the electrons called ‘spin’ is then influenced by tiny variations in the Earth’s magnetic field, and it is thought that quantum entanglement makes it possible for the bird to build a picture by linking different electrons.

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