How do mosquitoes find people at night?

Mosquitoes first roughly find the direction of their prey by the smell of the target, such as sweat and body odor, which can attract mosquitoes within the range of 10 meter.

When mosquitoes approach the target, they can sense the infrared radiation of the target. Generally, the thermal radiation of blood vessels is greater than that of skin, and the thermal radiation of bare skin is greater than that of covered skin, so mosquitoes can accurately find your skin exposed to the air and the location of blood vessels. To sum up, mosquitoes are looking for places with high thermal radiation to eat.

Extended data

In order to avoid being found, mosquitoes will inject anesthetics into the skin when biting, inject formic acid into the skin to cut the skin and blood vessels conveniently, and inject anticoagulants into the blood after entering the blood vessels to prevent blood coagulation, so that mosquitoes can suck blood happily.

Because formic acid injected by mosquitoes into the skin and anticoagulant in the blood are foreign substances, it will stimulate the human immune system to attack, which will lead to redness, itching and other phenomena. When the human body removes these foreign bodies, the itching symptoms will disappear and the redness will gradually subside.

Detumescence method: The simplest and most direct method is to use saliva, which is alkaline and can neutralize formic acid, and saliva also contains digestive enzymes, which can decompose anticoagulant to achieve the purpose of rapid detumescence and itching relief. The former method is too vulgar. The tall method is to use soapy water, which is alkaline and can neutralize formic acid to achieve the effect of relieving itching.

References:

Baidu encyclopedia-mosquito