Household Casebearer (Plaster Bagworm)

Indoor environments, particularly on walls, floors, and under furniture where dust and pet hair accumulate.

Larvae feed on spider webs, wool, human hair, dust, and discarded insect carcasses.

The larva builds a flattened, spindle-shaped silken case covered in sand or dust grains. It can move by poking its head out from either end of the case to crawl.

They are nuisance pests that can damage natural fibers like silk and wool, but they are generally harmless to humans and pets.