Why does the golden cicada know day and night underground, and only crawl out at night?

Golden cicada, commonly known as monkey. This animal is often seen on summer nights. Their unique call attracts many people to come and capture it.

But since the sight is not good at night, people will choose to capture them during the day. However, it was discovered during the day that the golden cicada would hide itself underground during the day. Then some people wonder why the golden cicada only crawls out at night.

In fact, this is mainly because the climate changes during the day and night, and the nervous system of the golden cicada itself is very sensitive, so the golden cicada will come out at night. <>

Climate change and natural selectionWe all know that nighttime is cooler and humid than during the day. Therefore, many people will choose to cool off at night. The same goes for golden cicadas.

Because they come out of the ground, the process of reaching the surface is relatively long, often taking about an hour. The temperature is high during the day, and if the golden cicadas choose to emerge during the day, they often have not yet reached the ground, and they will die of dehydration due to the hot climate. So they choose to travel at night.

Because the night will ensure that their appearance does not lose water, so the risk of death is reduced. In addition, the golden cicada chooses to crawl out at night to a certain extent to avoid the invasion of natural predators. The process of the golden cicada crawling out of the earth is his most vulnerable moment, if the golden cicada is targeted by natural enemies during this time, then the only thing that awaits them is death.

At night, many of their predators have rested, and this is the best time for them to excavate. Therefore, the golden cicada chooses to be unearthed at night, and there is also a certain factor in avoiding natural enemies. It is also the result of nature's survival of the fittest and natural selection.

Body structure scientists have conducted some research on the golden cicada, and the study has found that the temperature receptors on the surface of the golden cicada are very sensitive, and they can accurately perceive the temperature and humidity of their surroundings. Due to the particularity of natural enemies and its own structure, the golden cicada will use its own temperature receptors to perceive the external climate to determine whether it is night. This is one of the reasons why they chose to excavate at night.

The reason why the golden cicada chose to crawl out at night is also for its own better survival, which is also a concession and compromise that the golden cicada has to make under the premise of survival of the fittest in nature.

Due to natural evolution, the temperature changes during the day and at night, and the golden cicada has a good way to avoid the capture of natural enemies by virtue of its own sensing ability.

Because the climate changes during the day and night, and often its own nervous system is very sensitive. So it is often possible to perceive both day and night. The weather at night is cooler and the humidity is higher than during the day. Therefore, they set off in the evening.

Because the temperature at night is very different from the temperature during the day, and the nervous system of the golden cicada is more sensitive and can feel the change in this temperature, so it knows whether it is day or night, and the reason why it comes out at night is because the temperature is relatively low at night, there is humidity, and it will not let it come out and die of dehydration.

Golden Cicada. It usually comes out around 7 pm to 12 pm. The golden cicada usually comes out in the late afternoon, when it just starts to dark, and lasts until about 12 p.m.

The golden cicada unearthed the most before the rain, because of the air pressure before the rain, the golden cicada is very stuffy in the ground, and likes to run out of the hole.

The habits of the golden cicada.

Golden cicadas generally reproduce for one generation every 3 to 5 years, with eggs on the young branches of the current year or two years old and nymphs of each instar.

Concentrate on the roots of plants in the soil for overwintering.

The overwintering eggs begin to hatch in mid-May of the following year, and the hatching season is from late May to early June, and the hatching activity ends in late June.

About 80% of the golden cicada eggs hatch in the afternoon during the day, and 20% of the golden cicada eggs hatch at night. The egg period is close to 300 days. The activity of overwintering nymphs was most affected by ground temperature and sap of the host plant.

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.

At the end of June, the larvae begin to emerge into adults, with a maximum lifespan of about 60 to 70 days. In late July, the female adults begin to lay eggs, and the peak oviposition is in early and mid-August, and the eggs are mostly laid on branches with a thickness of 4 to 5 mm. When the adult female lays eggs, the ovipositor is punctured through the bark and inserted into the branch tissue, creating a claw-like orifice, and then laying eggs in the xylem.

Each spawning hole has 6 8 eggs. There are more than 90 cicada eggs on a branch. In areas where this insect is severe, it is common to see dead branches full of tree trunks by late autumn.

The eggs are laid and hatched in mid-June of the following year. After hatching, the larvae fall from the branches to the ground and burrow into the soil. The larvae live in the soil for several 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.

The life cycle of different cicadas varies, and the larval stage of the small green grass cicada is one year; It takes 3 years for the black grasshopper to complete its entire growth cycle; The 17-year-old cicada in the United States has the longest growth cycle, and it takes 17 years to live underground before it grows into a chirping cicada.

Cicadas belong to the family Homoptera. The life of a cicada is divided into four stages: starting with the egg, the egg hatches into a larva, the larva becomes a pupa, and the pupae finally metamorphoses into an adult – the cicada we see as it.

Cicada eggs are mostly laid in the subcutaneous tissues of young tree twigs, and it is not until the following spring and summer that the cicada eggs hatch into larvae. When the larvae grow up, they crawl out, shed their shells on grass or branches, molt and emerge into cicadas. When the wings harden, the male cicada sings "Zhizhi" on the branch and mates with the female, who dies shortly after mating and laying eggs.

The cicada is a male cicada, its articulator is in the abdomen, like a large drum covered with a layer of eardrum, the eardrum is vibrated and makes sound, because the sound muscle can be expanded and contracted about 10,000 times per second, the cover plate and the eardrum are empty, can play a role in resonance, so its song is particularly loud. And can take turns to sing passionately in a variety of different tones. The female cicada's musical instrument is not fully constructed and cannot make sounds, so it is a "dumb cicada".

The growth of cicadas is both long and very hard. The life cycle of the cicada is more than ten years, and in these long years, in the four stages of the cicada's life cycle, except for the summer of the last year, the first three stages are dormant in the ground. If people can know that cicadas can only come to the world once in more than ten years, they will feel that cicadas are precious.

Specifically, there are 13 years and 17 years.

The cicada crawls out of the soil from mid to late June (around the summer solstice) and early August (around the beginning of autumn).

From mid to late June (around the summer solstice) to early August (around the beginning of autumn), it is the best season to harvest Tianchang silver, and the weather is most concentrated in early July or after the rain.

Knowing that digging out of the hole with a pair of jagged forefeet in the wet and soft ground, after climbing out of the ground, it will make a short-term movement on the ground, and then prepare to molt on the trunk or scaffolding of the Fan Yuan, and the next morning at 4 6 o'clock to feather into an adult cicada, you can use a flashlight to illuminate, and at night on the ground and trunk of the tree to catch, or in the early morning to catch the young adult cicada on the tree.

The cicada has two pairs of membranous wings, compound eyes are prominent, and the cicadas that can sing are all male cicadas. The vocal apparatus at the base of the abdomen of the male cicada is like a large drum covered with a layer of tympanic membrane, and the eardrum is vibrated to produce sound.

Because the cicada's song muscle can expand and contract about 10,000 times per second, and the gap between the cover plate and the tympanic membrane is empty, which can play a resonant role, its song is particularly loud and bright.

It is known that it has the effect of clearing heat and detoxifying, enhancing physical fitness and stuffiness.

Clearing heat and detoxifying:Cicadas have a certain heat dissipation effect, and can also promote the discharge of toxins, and have the effect of clearing heat and detoxifying.

Enhance physical fitness:The nutritional value of cicadas is relatively rich, which can supplement nutrition and enhance physical fitness.

On rainy days at night, the golden cicada may come out of the soil, and the golden cicada is very fragile for a period of time after molting, and it cannot withstand the scorching summer sun at this time. Sometimes, even during the day, if there is rainy weather and there is no sun, the golden cicada may crawl out.

The natural predators of the golden cicada are mainly birds. Birds generally do not move at night. In this way, the golden cicada can avoid natural predators to the greatest extent possible during the hours when it molts and cannot move at night.

It won't rain if it rains, and it will come out at night when the weather clears after the rain.