Scientific explanation: any animal or plant, if it grows anywhere or nests there, must think that the environment there is the best, and its sensory system is more acute than human beings.
Snakes have always been the representative of dragons among the people, because of their similar shapes, and in ancient times, there was a saying that snakes turned jiaozi into dragons, and dragons were one of the noblest beasts. As a result, in the custom of geomantic omen, everyone thinks that it is a very auspicious thing for snakes to appear on the homestead. It shows that this place is a treasure trove of geomantic omen, and people who live here will be rich and auspicious, which is a sign of wealth and auspiciousness.
Solemnly declare: the answer is for reference only, please don't be blindly superstitious.