A reader sent us a good, if slightly disturbing, picture of a large group of white worms with black heads. The worms with black heads have congregated around an unidentified mass on the wall, which we presume is serving as some sort of food source. The wall on which the worms were found is in the family room of our reader’s home, and so not in the more common places one finds pest worms (like a pantry or toilet). The reader didn’t seem particularly alarmed by what she found, merely asking if we have “any ideas” about the small white worms with black heads. We’ll therefore approach this as a simple matter of worm identification and largely focus on this matter alone. What are the small white worms with black heads that our reader is finding?