First of all, there are flies, which are not only diverse, but also widely distributed. They have frequent contact with other animals and strong flying ability. Because of the contact with many things, it is easier to pollute food, and it is also used to spread typhoid, dysentery, cholera, plague, anthrax and other diseases. Even some fly maggots are directly parasitic in human or animal bodies, which will not only cause fly maggots, but also cause tissues to fester and rot, which has been harmful to health.
2. mosquitoes.
In fact, male mosquitoes feed on plant juice, while female mosquitoes feed on human or animal blood. However, mosquitoes have their own antiviral organs, so they will not be infected by biting themselves, and blood-sucking female mosquitoes are the intermediate disseminators of various pathogens, posing a direct threat to human health.
3. Rats.
However, rats are the most common people. In fact, rats can not only be infected with many pathogens, but also steal and destroy food, bite crops and even destroy saplings, thus persecuting the whole growth of forests. In addition, mice often chew on furniture, clothes, books and documents, which directly brings great trouble to people's lives.
4. cockroaches.
Cockroaches like to live in warm, humid, food-rich and narrow places, such as kitchens, canteens, food warehouses and sundries. In fact, cockroaches have a very strong reproductive ability and a flat body, so they can drill seams smoothly, so it is easy to erupt in large numbers in the house.