Ancient flying pigeons handed books. What kind of signal is it that pigeons send letters to people?

In ancient times, flying pigeons apparently spread books, but in fact their main principle was to spread information through the mode of pigeons going home. In some costume TV dramas, we usually see such scenes. If we want to send important information to our friends, we usually choose to send books by flying pigeons, and then tie a letter we wrote to the pigeon's leg and throw it out. Many people think pigeons are smart enough to know what their owners are thinking. In fact, if we dissect this problem carefully, pigeons are not so smart, they just want to go home, so in ancient times, the principle that pigeons want to go home was used by flying pigeons to deliver books. Whenever pigeons can only send letters in this way, I will give you a good explanation.

In ancient times, flying pigeons used pigeons to send letters home. Many friends may not understand why pigeons go home, because in ancient times, because the traffic was underdeveloped and there was no communication equipment, they had to find another way to convey information, so there was a flying pigeon to deliver books. Because pigeons fly faster, the ancients gave the task to pigeons instead of spreading information manually. After all, pigeons can run faster than horses and people.

In ancient times, flying pigeons gave books to others, but pigeons found their way home. In order to achieve the purpose of flying pigeons passing books, let's give an example. For example, a group of pigeons were raised in place A, and then a war broke out in place B. At this time, someone took a dozen pigeons from place A to place B for backup. When they want to send a signal to people in place A, they take them out of the pigeon coop in place B and tie envelopes on their legs. Then, when they put the pigeons in the air, they will automatically find their way home. At this time, they sent a signal to people in a place.

If you have any better ideas about this matter, please write them in the comments and we will discuss them together.