Why are cockroaches called cockroaches?

Cockroach, also known as cockroach, has become the creative material of film and television, and has been named "Xiao Qiang" in Hongkong. There are three common cockroaches at home: American cockroaches, which are large and brown; Oriental cockroaches are also larger, dark brown to black, while German cockroaches are smaller. There are more than 3,500 species of cockroaches, most of which live in the wild. On the giant side, there are Madagascar cockroaches with a body length of 8 cm (about 3 inches) and Australian giant burrowing cockroaches with a body length of about 9 cm and a weight of about 30 grams. It is reported that in 2004, scientists found a giant cockroach with a length of 10 cm (about 4 inches) in the tropical forest of Indonesia.

Strong vitality, not afraid of nuclear war

Cockroaches can live hundreds of millions of years. Their vitality is extremely tenacious. Without food, they can live for a month, without water supply, they can live for a week or even nine days without a head, and they can continue to lay eggs.

Headless cockroaches don't become ghosts, but they can survive because their structures are different from those of humans. It is said that cockroaches have heads all over their bodies. For example, the activity of cockroaches is not driven by spinal nerves, but controlled by the peripheral nerves of the body. Its activities are controlled by the lower abdomen, chest and head, and its head is in danger, and its body is still operating. At the same time, because cockroaches don't need brains to maintain breathing and blood pressure, they don't deliver oxygen to different tissues of the body through blood. Their bodies have a tracheal system, which breathes through the pores on their bodies. The pores connect pipes to bring oxygen to cells and expel carbon dioxide through pores, so if they lose their heads, they will not be affected. At the same time, they have no blood pressure, and even if their heads disappear, they will not bleed.

Blood? You can't help asking: Will you bleed?

Because cockroaches do not carry oxygen with heme, their blood is not red, but colorless. Only adult female cockroaches who are ready to lay eggs will have orange blood, because their liver will produce an orange substance similar to vitamin A, which will be sent to the ovaries as a nutrient to cultivate embryos.

Strictly speaking, cockroaches have more vitality than people. There is a saying that if a nuclear war breaks out, cockroaches will be survivors and humans will die, precisely because cockroaches can resist radiation. The researchers found that both insects and arthropods have the ability to resist radiation damage, and the key lies in their "shelling" instinct. Insects will double their weight every time they molt, and cells will only divide once when they molt. Cell division is particularly sensitive to radiation, which is also the mechanism of radiotherapy, because cancer cells are more active than normal cells. If cockroaches shed their shells once a week, their cell division will be completed within 48 hours. Once a nuclear war breaks out, radiation will affect all living things, but three-quarters of cockroaches are not in a state of cell division, so they will not be killed. On the contrary, human beings are in splinter cell all the time, and as a result, none of them can be left behind!

Clean yourself, clean and natural.

It may be hard to believe that cockroaches love cleaning, but it turns out to be an indisputable fact.

In biological classification, cockroaches belong to Cockroaches and Insects. Cockroaches, like other insects, have the ability of self-cleaning, because they must keep their tentacles and limbs clean, so as to be alert to food, water and enemies at any time and place. This is the way of nature's survival.

Cockroaches are omnivores. Except for a species called Crytocercus, which mainly eats wood, other species can be said to eat any organic matter. They like starch, sweets, high-fat foods, and even meat and insect carcasses. They even eat glue, such as glue on the back of stamps, or glue on books and paper, because traditional glue is extracted from protein. In the forest, cockroaches will eat grass and leaves, clean up nature, and then discharge organic matter, nourish the earth and maintain ecological balance. They are also food sources for many birds, salamanders, lizards and small mammals. This subtle combination maintains ecological balance and biodiversity.

Humans labeled cockroaches as "pests" and eradicated them. This is also from the perspective of human beings, mainly because they spread bacteria. Cockroaches are considered as hotbeds of a series of bacteria, such as Salmonella, Staphylococcus and Streptococcus. At the same time, they are also secondary dust? After that, another allergen is easy to cause asthma recurrence. Cockroaches carry bacteria because they move in crevices, canals, food scraps, garbage dumps and other places at home, and they are easily infected with bacteria. Once bacteria enter their bodies, they can live in the digestive system of cockroaches for several months or even a year, and then spread with excrement. When cockroaches eat or pass by human food, they spread everywhere. They are not the source of bacteria, but bacteria are parasitic on them.

There are more than 3,500 species of cockroaches, but not many species live in human settlements. Humans built large-scale buildings, destroyed forests and built houses, and some cockroaches began to move into houses. Because human dwellings provide them with food and water, cockroaches who are afraid of the cold naturally regard it as a "comfortable nest"; Modern architecture is designed with sewers extending in all directions, which is an ideal hiding environment. In the indoor environment, although the creatures that prey on them do not exist, even the spiders that threaten them are extinct in most urbanites' homes, and cockroaches can breed safely. For cockroaches, the greater threat comes from every possible means of extermination by human beings, just like all kinds of pesticides. But at this stage, cockroaches still seem to be the "winners" in all annihilation wars, while highly toxic pesticides have harmed other creatures.

Cockroaches also migrate.

Cockroaches can be traced all over the world, so it is not easy to trace the source of a single species. Their common name may mislead you, thinking that American cockroaches are American immigrants and German cockroaches are Germans. The origin of American cockroach is estimated to be in northern Africa, and then it breeds in South America, so it has a common name. It is estimated that the German cockroach arrived in Europe with Kyle's Baltic or earlier maritime trade, and it originated in Southeast Asia. As for the origin of oriental cockroaches, it is estimated that they are in northern Africa and southern Russia. Many times, the same cockroach will have different common names in different areas. It can be seen that American cockroaches and oriental cockroaches, which are common in our family at present, are actually immigrants brought by global trade.

References:/question/question/24601557.html.