How Birds See Earth's Magnetic Field ⚡ экспресс
The study unpacks how birds feel Earth's magnetic field. In their eyes, a protein called cryptochrome, triggered by light, spawns particle pairs that respond to magnetism, firing off faint electrical signals—a bit like a compass needle swinging north. This keeps them on course. Could this kind of “biological vision” someday spark new navigation tech?
Birds migrate using the magnetic field. In their eyes, there's a protein called cryptochrome. It captures sunlight, especially blue light, and triggers a reaction. Absorption of light leads to the formation of a particle pair that is acutely sensitive to magnetic fields.
Under the field's influence, these particles change their mutual position, causing a weak electric current in the protein. This current travels to the brain and is perceived as a visual sensation—as if a transparent grid of magnetic lines is overlaid on the world. Surprisingly, this compass only works in daytime blue light; at dusk the system shuts down, and at night birds rely on the stars.
Understanding this mechanism not only reveals the secret of navigation but also promises new technologies. The protein is made of ordinary organic compounds, including carbon, so scientists hope to create biosensors that are more compact and sensitive than their electronic counterparts.
🎯 This same protein is present in human eyes too, but in us it only regulates biological clocks, and we don't sense magnetic fields.