“I found this in my loo”, writes this reader about the long, dark worm pictured below in a toilet bowl. “Please help.” He provides no further context, and we must say that the photo he provided is quite dark and not the best quality, which makes it harder to see the worm’s physical characteristics (other than the obvious ones). With that said, we can still make an educated guess as to what it is, and in any case, we would guess that it is some kind of detritivore. Detritivores are organisms that feed on decomposing organic matter, and there are plenty of worms and worm-like organisms that fit this description, including earthworms and millipedes.