The ability to see Earth’s magnetic field, thought to be restricted to certain animals who use it for navigation, also resides in human eyes. Cryptochrome 2, a key protein component of geomagnetic perception, is also found in humans.
- Humans Might Be Able to See the Earth’s Magnetic Field, Like Birds Do (Popular Science)
- Humans Could Have Geomagnetic Sight (Wired)
- Geomagnetism (NOAA – National Geophysical Data Center)