Mud-packed screw holes reveal a bee nursery in a homeowner’s door

A homeowner spots bees around two screw holes in a plastic front door and later finds a gray, cement-like material packed into the holes. Reddit users suggest it’s mud used by mason bees to construct an egg-filled nest, illustrating how solitary bees often use tiny cavities for nesting. The piece emphasizes observing and correctly identifying the species before taking action, as these nesting sites can be beneficial pollinators rather than pests.