Is it lucky to have a bird's nest on the roof?

In fact, people always think that it is auspicious for swallows to nest and have children under their own eaves, which is a symbol of a better life. Besides, swallows are beneficial birds, and no one digs their nests. I remember digging bird's nest with my friends when I was a child, and my father beat me when I came home. Besides, he won't hurt you if he lives there! Just be a poor little animal ~ I'd rather believe it than believe it!