How does the golden cicada perceive time, and why does it happen to emerge from the ground at night

Golden cicadas can sense time through temperature, because the temperature is higher during the day, and the temperature is lower at night, and the shelling is because they can avoid their natural enemies, and the temperature at night is relatively low, which is suitable for shelling.

The golden cicada unearthed at this time is more conducive to its own shelling process, because it is warm and humid, the shell of the golden toad will not be so hard and easy to shed. And if it is unearthed in the hot day, after exposure to the sun, the shell may become very hard, and the process of shelling cannot be completed at all.

They all dig a small hole near the tree to see the sky outside, and when it gets dark, they will break through the ground.

They judge the light and humidity by making holes in advance, and if they can meet their conditions, they will come out, so they all come out at night, and the main reason for coming out at night is to avoid predators.

When the golden cicada matures in summer, it will slowly burrow to the surface, pull out a small hole, and sense the light through the small hole to determine the time. Climb out of the surface at the right time and climb high to shed your shell.

Don't say it, I've really observed this. Cicadas actually start digging their burrows long before they crawl out of the ground, digging close to the surface and opening a tiny hole to sense the light outside, and then crawling out of the hole when it gets dark. This is why sometimes in the summer, when you use your hand to clasp the hole the size of a mung bean under the tree during the day, you find that the hole under it is empty, and there are cicadas hidden underneath.

Many truths are not as complex and mysterious as we think, but are hidden in nature, and we can know them by careful observation.

It is to complete the transformation of the golden cicada to the knowledge. <>

The "monkey" is actually a nymph of the cicada, and its scientific name can be called the golden cicada. After the step of shedding its shell, the golden cicada will eventually become a real cicada. The cicada song we hear every summer is the adult stage of the cicada, which is ripe for the breeding season.

The male cicada makes a crisp sound by the buzzer on its abdomen, while the female cicada has more developed ovipositors, so it preempts the buzzer's position, so the female cicada does not "sing". <

June to August is the spawning period of cicadas. They pierce deep egg chambers in the branches through ovipositors. Generally, there are seven or eight fertilized eggs in an egg chamber.

Some fertilized eggs hatch in the same year, while others hatch in June-July of the following year after wintering, and the nymphs that hatch feed on the sap of the trees. After a few days of development, the nymphs fall from the tree into the soil, and then burrow into the soil to grow for 3-5 years, which is also the nymph stage of this species. When it grows to the last larva, it is the time when it is about to emerge, because it will soon become an adult and reproduce in the next generation, and we can call it the golden cicada.

Golden cicadas belong to insects, and their bodies are rich in nutrients, with a protein content of more than 70%. In addition, it contains up to 7% fat, as well as a variety of vitamins and trace elements. So there are many natural predators, especially birds, who like to feed on cicadas.

Birds and other predators do most of their activities during the day. If the golden cicada burrows out of the ground during the day, there is a high chance of being eaten by birds. In addition, the golden cicada's ability to move is limited, especially when molting.

If this state is in the daytime, it will not only increase the risk of predation by natural predators, but also increase the risk of water loss under strong solar radiation, posing a serious threat to life and health. As a result, the golden cicadas that broke through the ground during the day in history were either eaten or dehydrated and died. Only those who go out at night will be saved.

So, what we see feels like a golden cicada shedding its shell, which is essentially a result of biological evolution and survival of the fittest.

Mainly because they can only have wings after shedding their shells, this is a process that flying insects must go through.

Because the larvae do not need wings to live underground, they need to shed their shells to grow wings to fly.

This is also the way to want to grow, to become an adult, so it is to appear in such a state and get rid of it.

It is because this animal has a very strong sense of direction and a very strong sense of smell, so it can crawl out at night.

Because there is a large difference in temperature between day and night, and the temperature change can often be felt underground, when the sun sets and the ground temperature becomes low, it is often known underground, and it will also climb out of the ground to perform a secret room and ventilation.

This is because when the cicada is underground, it will use its forefoot to make a small hole in the ground, and from this small hole, you can know whether it is day or night.

As for how cicadas (golden cicadas) distinguish between day and night, I believe that many people are more interested in it, as are their assistants. We all know that golden cicadas come out at night or at night. Generally, we can catch them with a flashlight after dinner, just in time to get them out of the hole.

Why, then, did they know it was dark when they were in the cave? On this issue, the little helper will talk about his point of view. It is right or wrong in three ways.

After reading it, you can express your opinion. Golden cicadas can sense changes in temperature through their senses or other aspects. For example, when the surface temperature is high during the day, the golden cicada can feel it in the hole.

When the temperature drops at night or at night, the surface temperature drops with it. When the golden cicada senses it, it burrows its hole. Maybe it's also afraid that the temperature is too high and won't change easily.

things, but after the change, one is underground and the other is above ground, but they can still communicate with each other through **.

Interested friends can observe that the call of the cicada is not the same in the morning, noon and evening, and the sound will be different (this opinion is found in an article, and its authenticity is uncertain). Therefore, at night or in the evening, when the underground golden cicada hears the call of different cicadas, it knows that it can come out of the hole (about this, some people say that the golden cicada is deaf and cannot hear sounds, but some people retort that the golden cicada can only hear sounds within a certain frequency fluctuation range, and only the golden cicada and the cicada can know each other, so they can communicate).

The natural "ability" golden cicada can perceive day and night, which is an innate "ability". Just like us humans, we can tell if the sun is day or night by watching it rise or set, and the golden cicada also has its references, but we don't know very well (it is estimated that in the world of the golden cicada, they do not know how humans judge day and night). So, in our opinion, there is something magical.

Maybe they didn't take that into account.

They can judge by how wet the land is, how warm the land is. This is due to the fact that the temperature of the land drops at night, so they realize that it is already night and can climb out.

The cicada chooses to emerge at night is undoubtedly the most beneficial for it, on the one hand, it can avoid the scorching sun, and on the other hand, it can avoid natural enemies with a high probability. The main way it judges day and night is through the light that comes through the small holes in the ground.

Mainly judged by humidity, golden cicadas also have a certain sense ability, which can also be judged by the temperature of the soil. This is also possible to avoid predators.

The process of cicada shedding its shell:

The larvae of cicadas live in the soil, sucking the sap of plant roots, weakening the tree, causing the branches to die, and affecting the growth of the tree. The larvae of grasshoppers live in the soil all their lives. When it is about to be feathered, it burrows out of the surface at dusk and at night, climbs on a tree, and then grabs the bark of the tree to molt and feather.

The larvae live in soil for several years (cicada larvae in the forests of the eastern coast of North America can live underground for up to 17 years) and molt a total of 5 times. When spring is warm, the larvae move upwards to suck the sap of plant roots, and when autumn turns to winter, they go deep into the soil to avoid the cold. The body of the young larvae is mostly white or yellow, very soft, and the forehead is significantly enlarged.

The body of the old larvae is hard, yellowish-brown, the wing buds are very developed, and there is a molting line from the top of the head to the back of the thorax **, which is the dehiscence line when the adult is born.

What a cicada looks like when it sheds its shell:

The shell of the cicada shed:

The dehulled cicada has 2 pairs of wings and 3 pairs of legs, and is an adult. Here's how the golden cicada sheds its shell:

1. Because the cicada has a relatively hard skin on the surface of its body, this layer of skin prevents the outflow of substances in the body and prevents the invasion of harmful substances from the outside world. In this way, it is very detrimental to the growth of cicada larvae, and it restricts the growth of the young cicada's body. For the growth of cicada larvae.

So shell often.

2. The larvae of the cicada begin to emerge from the ground and climb onto tree trunks, branches, or crops, and blades of grass for fixation of the body. The shedding of cicadas is concentrated between 9 and 10 p.m., and the rest of the time is less so.

3. After fixation, the body does not move, as if dead. A hole began to crack on the top of the head, and the body slowly came out. It takes about 1 hour from the crack to the complete exit, and after the shell is shed, the wings and body are soft and white, and they cannot fly at this time.

After about 1 hour, the body slowly turns black, and I also have the ability to fly.

4. The empty shell after shelling is left in place.

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