Humans have known bats for a long time, and some ethnic groups like bats very much. In China, because of the homonym of "bat" and "blessing", the bat is a symbol of good luck and can be called the mascot of China. Gifts painted or engraved with bats are usually used to wish happiness and good luck.
Bats have been mascots since ancient times, not only because their names are homophonic, but also because they have a very sensitive aura, and they will settle down in an auspicious and safe aura!
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Bat is a good teacher of human beings, who invented radar by imitating bat's echolocation system. Stealth planes developed by some countries are also copies of bats to some extent.
In medicine, anticoagulant protein extracted from vampire bat saliva can dissolve thrombus twice as fast as some drugs used in clinic. The excrement of insect-eating bats is called "night sand" in Chinese medicine, which has the function of clearing away heat and improving eyesight.
The excrement of bats has been used by humans for centuries, and it is an economical and high-quality agricultural fertilizer in many tropical countries.