Some scientists speculate that there are two possibilities for birds to return to their old nests. One is that they will remember the position of the stars in their home and then navigate through the changes in the positions of the stars in the sky; They can sense changes in the earth's magnetic field and then use the magnetic field to determine their location and their old nest.
Swallows are a typical long-distance migratory bird. During their migration, they often cross oceans and mountains. Barn swallows in our country can even fly to India or Australia in winter. However, regardless of their Every year, they fly no matter how far they fly during the winter, and they fly back to their old nests in spring to breed. Northern Song Dynasty. Ruan Yinu's "Huanxi Sand" The new leaves have just begun to bloom, leaving no trace, and the green mountains reflect the soul. Light smoke and half a cage at dusk. Swallows return to find their old strongholds, and their splendor is gone. Flowers fall with the catkins.
This Song poem has a history of more than a thousand years. In fact, before the Northern Song Dynasty, people discovered the habit of swallows looking for their old nests.
Swallows are birds that are good at flying. They can reach an altitude of up to three thousand meters and can glide about 20 centimeters above the ground at their lowest. The flight speed of ordinary swallows can reach 120 kilometers per hour. Kilometers. According to scientists, brown swifts in India can reach a speed of 276.47 kilometers per hour. They fly in the air most of the day and rarely rest.
The French science magazine "Wild Land" mentioned in "Swallows: Migration Journey" that no matter how far away from home swallows are, they can finally find themselves last spring by virtue of their amazing memory or other abilities. 's lair.
Scientists have two speculations about the ability of swallows to find old nests: astronomical navigation
Scientists believe that many animals use the stars in the sky to locate their position, such as dung beetles. No matter how far away from the nest, you can push the dung ball home in a straight direction. Scientists believe that most birds migrate at night. Through experimental studies, scientists have found that birds and dung beetles will remember their homes. The position of the stars in the sky, and then navigate for yourself through the changes in the position of the stars in the sky. Geomagnetic induction
Scientists have discovered that birds should be able to sense subtle changes in the earth's magnetic field and then determine their position and purpose. In December 2014, the "Journal of Experimental Biology" wrote that birds have exquisite photoreceptor proteins, and birds use the coenzyme function of this sensor protein to sense changes in the geomagnetic field and navigate.
Animals in nature often have various incredible special abilities, waiting for our continuous research and exploration.