Why are there no mosquitoes whose bites don’t itch?

Speaking of the most annoying animals, they are flies, mosquitoes, rats and cockroaches, which are known as the four pests. As the weather gets warmer, these animals are becoming more active.

A few days ago, I saw that cockroach bait and rat poison were placed in the community. How to deal with flies and mosquitoes? In fact, now people live in buildings, flies have become much less, but there are still many in the village. But mosquitoes, this thing, even if you live in a building, it can fly up, and when you go out for a walk at night, if there are trees on both sides of the road, you will inevitably be bitten. Sometimes I have to sigh: you bite people, it’s okay to give them some blood, but why does the skin swell and itch after being bitten? This is very annoying, and it seems that in recent years, it seems that it takes several days for mosquito bites to go away...

Why don't mosquitoes evolve to bite humans without causing them to itch? Wouldn't that be more beneficial for their survival? Today, let's talk about this from a biological perspective.

01. About Evolution

People who are engaged in evolution actually dislike the idea of ​​putting people first (commonly known as self-sentiment).

For example, when studying reptiles, you can explore how these creatures gain survival advantages, such as how they breathe.

But if you are talking about the relationship between reptiles and humans, you have to be extra careful, because when reptiles crawled onto the earth, humans had not yet appeared! Many of their characteristics actually have nothing to do with humans. If you insist on linking them together, it is easy to cause problems.

The same is true for mosquitoes.

02. Mosquitoes and Humans

The mosquito really didn't expect it to feed on humans!

1. When mosquitoes appeared on Earth, humans had not yet appeared. Mosquitoes appeared at least 100 million years ago, when humans had not yet appeared, so mosquitoes did not consider humans when they first appeared.

2. Humans did not exist for a large period of time when mosquitoes existed. Apart from their early origin, humans did not exist for a large period of time when mosquitoes lived. If a mosquito lived for 100 years, then it had never seen a human before it was 97 years old. When it reached the last few days of its 99th year, humans suddenly became the most numerous large mammals in the world.

How does it survive? It can't be hungry. Therefore, the mosquito's mouthparts were not designed for humans from the beginning, and it still is not the case now.

03. About Mosquitoes

Their main targets are those animals with rough skin and flesh in nature.

1. Make the mouthparts very thin and minimize stimulation to the animals

2. Make the mouthparts very strong, regardless of the stimulation to the animal, to improve the efficiency of eating

Which one is more suitable for mosquitoes? Without a doubt, the second one. In fact, gadflies, which bite more fiercely than mosquitoes, are still alive and well.

It can be seen that the second strategy is indeed more effective.

04. Are there mosquitoes whose bites don’t make people feel itchy?

As for mosquitoes whose bites don’t cause itching, they have only evolved a short time ago, so just wait and see.

after all

1. It really didn’t take long for humans to shed their hair

2. It has been less than 100 years since humans became the largest large animal in the world (the second place is sheep, with about 2.1 billion in the world)

3. There are too many humans in the world. You should know that the number of sheep, pigs and cows in the second, third and fourth places combined is not as large as that of humans. It can be said that the material is extremely abundant. They lack the motivation to evolve!

After all, before this, the main food source of mosquitoes was not humans.

Finally, let me briefly summarize.

1. Mosquitoes never thought of feeding on humans.

2. There are too many humans nowadays, which provides a huge amount of material for mosquitoes and they have no motivation to evolve.