There is a bird's nest on the tree in front of the door, which shows that the environment in front of the door is better. Otherwise, birds will not nest in trees. There is a bird's nest in the tree in front of the door, which is a symbol of good luck.
There is a saying that even birds will not go wrong. It can be seen that birds can nest in the trees in front of the door, which shows that this place is auspicious and not a place of right and wrong. Otherwise, the birds will not choose the tree in front of the door as a safe place.