Occasionally I notice worm-like larvae climbing up the interior walls of my house. They look like maggots, but surrounded by a cocoon of debris that they seem to pick up off the floor (cat hair, dust, etc.). They stick their heads out to climb but otherwise remain in the cocoon. The cocoons are about half an inch long.
I took some pictures of one but it says under posting rules that I’m not allowed to post attachments. Anybody know what these things turn into when they grow up?