How Birds Read the Earth Magnetic Field
How Birds Read the Earth Magnetic Field — Before this ability of the bird I am made humble. In a place we deem empty, a clear road was drawn for another life. The world was never only as much as we sense. The older I grow, the easier it has been to take what I have seen and heard as the whole of the world. But nature tells us a grain I cannot feel, a road I do not know, is always flowing alongside. Perhaps within us too lies a sense of direction we do not notice — a certain pull toward the right side, inscribed in the body by the years we have lived. As the bird follows the magnetic field, we too may trust that pull deep in the heart.
In autumn migratory birds fly thousands of miles to warm lands, and in spring return without fail to the same nest. They have no map, no compass, no one to teach the route. Over open seas and above the clouds, in a sky with not a single landmark, what does that small bird see to find its way? Is the sky, empty to our eyes, a map drawn with roads to the bird?
For long, people covered the bird homing with a single word — instinct. But "instinct" is no answer; it merely defers the question. That the earth is a giant magnet had long been known: the compass needle ever pointing north is the proof. In the mid-20th century, scientists wondered: if a man-made iron needle feels the magnetic field, might a living creature feel it too? It was observed that a caged migratory bird, when its season to leave came, turned its body toward the direction it should go and grew restless.
The experiments gave an astonishing answer. Placed in an artificial magnetic field and its direction turned, the bird truly tried to fly the wrong way. The bird was plainly feeling the earth magnetic field. Deeper study revealed something stranger still: in many migratory birds the magnetic sense is linked to the eyes. In the bird retina is a special protein that, on receiving light, reacts faintly according to the magnetic field — so the bird may not "feel" the field but perhaps "see" it. The sky empty to our eyes may be, to the bird, a landscape shimmering with the patterns of magnetism. Yet exactly how it works is not yet fully known.
- Research into this avian magnetic sense opened a new field, quantum biology, showing that life most exquisite ability may be rooted in quantum phenomena of the microscopic world.
- The compasses and satellite navigation humans built also find their way by leaning on the same earthly magnetic field. A skill birds mastered millions of years earlier, we imitate with machines.
- Turtles, salmon, and honeybees each take the magnetic field as their guide. The earth magnetic pattern, invisible to the eye, becomes an unseen road for countless lives.
引은 활을 당기듯 끌어당김을 뜻하니, 보이지 않는 자기장이 새를 옳은 방향으로 이끄는 힘과 통한다.
Meet this hanja in Cheonjamun →Before this ability of the bird I am made humble. In a place we deem empty, a clear road was drawn for another life. The world was never only as much as we sense. The older I grow, the easier it has been to take what I have seen and heard as the whole of the world. But nature tells us a grain I cannot feel, a road I do not know, is always flowing alongside. Perhaps within us too lies a sense of direction we do not notice — a certain pull toward the right side, inscribed in the body by the years we have lived. As the bird follows the magnetic field, we too may trust that pull deep in the heart.
