The old man said it was unlucky. After all, if the bird's nest is somewhere in his home, it is a symbol of wealth. If it falls, it will be very unfortunate.
This kind of swallow is small and lovely, and the most important thing is that it is clean. They will not only take out their own excrement and throw it away, but sometimes even throw away the excrement of swallows, just like human beings love cleanliness. But because of the modern living environment, it is difficult to see them now. Slowly, the streets are full of ordinary domestic swallows, all black and gray in color, and the nests will be smaller. The annoying aspect is that they make a hullabaloo about and pee at night.