1, cleaning behavior
The tentacles and feet of flies are covered with sensory organs and bristles to help them perceive the environment and obtain information. By rubbing hands and feet, flies can clean these sensory organs and remove dirt, dust or other particles attached to them.
2. Excretion behavior
Rubbing hands and feet may also be related to excretory behavior. Flies are waste decomposers. When they eat liquid food, they release digestive juice. Rubbing hands and feet can help flies clean up or disperse digestive juices.
Step 3 find food and mate
Flies rubbing their hands and feet may be related to finding food and mating. They have sensory organs on their antennae and feet, which are used to detect chemical signals of food and mates. Rubbing hands and feet may help improve tactile sensitivity and help flies better perceive and locate food or spouses.
There is no reason why flies are extinct.
Flies are abnormal and have strong vitality. Each female lays a large number of eggs and has a high hatching rate. These are the reasons why they can survive and not become extinct. Because larvae and adults live in two different environments, which is equivalent to expanding the living environment of this species, adults can fly, covering basically three levels: land, sea and air.
On the other hand, according to Darwin's theory of evolution, these two kinds of insects have retained many survival skills after evolution. For example, the eyes of flies can observe the surrounding environment 360 degrees, and the flight response is flexible. Mosquitoes are good at sensing temperature and smell. They move at night, so most other animals rest just to let them hunt.