- Special proteins in migratory birds’ eyes absorb blue light, and get triggered by the energy of the blue light photons.
- One protein: Cry4, is made of 2 molecules with extra one extra electron each. When excited by the photons, the electrons will become quantum entangled into a pair.
- This entangled pair is now susceptible to medium-scale magnetic fields, such as that of the Earth’s.
- As the bird changes flight direction, the entangled electrons experience Earth’s magnetism differently, and cause the Cry4 protein to send differing chemical signals depending on the bird’s flight direction!
- With Cry4 being in the birds eyes, sending different chemical signals, scientists predict that birds can see Earth’s magnetic field slightly differently, depending on their flight direction. This would allow for relatively smooth and precised navigation during migration season
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