Magnetoreception

Animals from all throughout the animal kingdom have been found to possess magnetoreception, or the capacity to detect the Earth's magnetic field. A wide range of organisms, including migratory birds, marine creatures, and even some species of butterflies, have it in various forms. The majority of them also have the ability to perceive the magnetic field with their eyes, which is really interesting.

While having a sort of built-in GPS at all times would be convenient, humans have largely lost that ability. But according to some recent studies, it might not be entirely gone. Researchers from Caltech and the University of Tokyo revealed in one study that changes in our environment's magnetic field cause audible changes in the brain, demonstrating for the first time that humans are capable of magnetoreception. Additionally, it is purely subconscious, which may have been quite helpful for early human navigation.