The consequence is that swallows will never come to your house again, and they will not come for several years. Which nest the swallow looks at will bring good luck to the family. You can't poke the bird's nest. If you poke a swallow and go to another house, you will have no good luck.
Swallows use mud as their nests, and their appearance is rough and not smooth, mixed with grass leaves and mud. Bird's nest has the shape of a half bowl, vase, pot, dish and bowl. Semi-bowl-shaped: Bird's nest is semi-bowl-shaped, with one side glued to the wall. This structure is not strong, so swallows like to choose the protruding place on the wall as the base for nesting.