Homeowner discovers bees using 'cement' to create egg chambers in door.

A homeowner discovered a cement-like substance in the screw holes of their plastic front door, prompting confusion about its origin. Seeking clarification, they posted on Reddit, where users suggested that the gray material was likely mud, indicating that bees were trying to create a nursery. The original poster noted the presence of bees around the holes but mentioned they weren't entering the door, and the gray substance was new since their purchase.

Commenters quickly identified the hard material as mud used by bees for nesting. One user shared a similar experience with a mason bee that built an egg chamber in their door lock. While many associate bees with large hives, some solitary species utilize small cavities, like screw holes, for nesting, sealing them with mud.