On my windowsill (on the inside of the room) this morning were a few dozen tiny black worms, about 2-3mm long. They move like caterpillars. Most of them are in a group by the windowsill, but some of them have climbed to the top of my curtain (about a metre high) and some of them have climbed to the bottom of my towel which is drying on the radiator (about a metre down). They appear to be able to secrete some kind of silk, for some of them dangle from the curtain seemingly in mid-air. I do not know what they are. Can you help me with this? What are they? Are they dangerous? Should I spray them with something poisonous? Are they likely to be carrying any kind of disease transmissible to humans? I suppose they may be the larval form of something. A picture: Please Register or Log in to view the hidden image!