A reader recently sent us a picture and asked us one straightforward question: “what the hell is this?” What the hell indeed. The picture appears to depict some sort of plump worm, by which we mean the worm has a relatively thin posterior and anterior end, and a fat middle. However, the image isn’t very clear, and in fact it is hard to tell if the fat middle is actually a part of the worm itself, or if it is something covering the worm (like mud or something like that). Below we attempt to address our reader’s question to the extent that this is even possible.