How could the swallow remember the way home?

This question is really hard. It remembers its surroundings and is familiar with other animals in its vicinity. Probably,

More authoritative explanations include the acute sense of smell and the detection of magnetic fields. Now, after decades of research, scientists have confirmed that the pigeon's upper beak does indeed have a unit cell that can sense magnetic fields, and it is this organ that guides the pigeon's flight. Recently, scientists announced after a series of meticulous behavioral experiments in the laboratory that they have definitively demonstrated for the first time that pigeons have magnetic perception, like a simple magnetic compass, which allows pigeons, and perhaps other birds and turtles, to use the Earth's magnetic field for navigation.

Scientists now agree that birds, including pigeons, can determine their absolute and relative positions by using the Earth's magnetic field. The magnetic field lines emanating from the two magnetic poles of the earth are perpendicular at the poles and turn parallel to the regions within the Tropic of Capricorn. At high latitudes, the Earth's magnetic force is very strong; In the equatorial region, it will be weaker.

Due to the difference in the magnitude and direction of the magnetic force, a number of geomagnetic road signs are formed. There is a large body of evidence that birds can rely on this geomagnetic signpost as their own navigation system. Birds may sense the strength and direction of the Earth's magnetic field through pigments in the retina of the eye.

In addition, at the upper beak, crystalline magnetite-like tissues can also sense the Earth's magnetic field. But scientists say that's not all birds are capable of. Since the 50s of the last century, ornithologists have recognized that birds use the sun as a compass to determine their direction.

The sun rises in the east every day, generally about 15 degrees per hour, and finally sets in the west. Birds are definitely experts on this issue.

Further research has found that birds determine direction by combining multiple cues and feelings. What's even more interesting is that as the environment changes, birds can adjust their directional decision-making system very well. For example, pigeons use the sun as their compass on a sunny day, but when the sun is not visible, they refer mainly to the geomagnetic signals they sense.

Migratory birds that move at dawn and dusk, such as robins, are most likely oriented by polarized light at sunrise and sunset.

The swallow's [bai's nest] is just a place for swallows to hatch and raise their chicks (or just a tool for hatching), and its nature is not the same thing as the concept of human genus [home]; When the young swallows hatch and grow to fly, the whole family goes to live in the wild. But if all is normal, the swallow parents will return to nest and hatch their birds next spring.

Swallows and other birds rely on the earth's magnetic field to determine their direction when flying, so swallows and other birds have a strong sense of direction, and even in the second spring, they can find the first place to nest. It is believed that there are many miraculous things in nature, and people have even relied on the flight of swallows to find the secret that allows airplanes to fly freely in the air.

I believe that many people in the Bandung Forest Group have discovered such a thing, the swallow will come to the house every spring, and then in the autumn he will fly to the south to spend the winter, but in the spring of the second year, the swallows can also successfully find the first nesting place. This is mainly because many birds rely on the earth's magnetic field to determine the direction, and they have a very strong sense of direction, so even in extreme weather such as fog, they can find their direction smoothly.

In addition, birds such as swallows can also orient themselves based on the natural polarization of sunlight. For swallows, when visible light shines on the retina, a pigment on the retina, electrons on the retina become active. The pigment on the retina plays a very important role in the vision of the swallow, when the pigment on the retina, the electrons are active, and it can smoothly fly forward according to the earth's magnetic field.

Swallow is a migratory bird, it will fly to the south to spend the winter when the winter comes, and in the spring it will fly back to the north from the south, thanks to the swallow's good sense of direction, so he can find his nest very smoothly, may be for many people swallows can find their nest in the vast sea of people, it is a very magical thing to bury oranges, but for swallows, it is like going home in autumn and spring, a very normal thing.

The swallow is a common bird around us, it is a migratory bird; In the autumn of each year, they leave their place of residence to spend the winter in the warm south, and then fly back to their place of residence again in the spring of the following year.

In addition to being a migratory bird, the swallow is also a beneficial bird that helps us humans to eradicate pests and protect our crops and homes.

In such a situation, we all like the swallow very much; Many times it is also very much liked that it lives under our roof. Even if we pull the feces on our ground, we don't hate them.

And this bird has a magical place, once the nesting is completed, it will return here almost every spring. If one day, they suddenly leave the nest, it may be one of the following:

First, the need to find a new home for swallows will also breed in their nests every year; As the baby swallows grow up, their nests become extra crowded.

In such cases, they will go to find a new place and start building a nest again so that they can accommodate it and live with their families.

Of course, many times, it is also because they feel threatened that they do not want to stay where they are. And this threat may come from the cats we raise, or it may be the sparrows in nature.

In our lives, we can often see sparrows encroaching on the swallow's nest after the swallow is gone. And when the swallow sees that its nest is encroached upon, it will take the initiative to leave.

Second, the swallow has an accident For the swallow, it will not be easy to give up its nest, because nesting is also a very difficult thing. If one day, there is a sudden act of leaving, it may be that the swallow is no longer there.

After all, in nature, they also have many natural enemies; And among the many swallows, swallows are born every year and swallows die every year.

So when the swallows leave suddenly, either the home is no longer suitable for them; Either they have an accident and will never be able to return to their own home.

When the little swallows just regret that they will fly out of the nest, they will also return to their nests, and during the day they will learn the skills of flying under the leadership of their parents and learn to find food, and when the night comes, their parents will take them back to their nests, because it is not safe in the wild at night, and it is easy to be preyed upon by birds of prey and snakes at night, and it is safest to return to their nests. At the same time, it can also prevent wind and rain in the wild to prevent illness.

When the little swallow learns what it has learned, it will fly south with its parents, so that it will leave its nest.

Swallows are very spiritual birds, they have a super memory, and there may be three situations when swallows fly away at night.

First, the swallow may have gone out to forage for food and flew too far and was delayed, and it will fly back the next day.

Second, the swallows may not like your living environment, maybe the air is not good, or it is noisy, or it may have less food to eat. It won't come back.

Thirdly, the swallows may fly back to the south for the winter due to climate changes, and they will come back next year.