Household Casebearer (often specifically the Plaster Bagworm or similar Case-bearing Cloths Moth larva)

Found indoors in homes, typically in dark, humid corners, underneath furniture, closets, garages, and on stucco or plaster walls.

The larvae feed on keratin found in natural fibers (wool, silk), spider webs, hair, lint, dead insects, and dried animal skin.

The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, soil, frass, paint fragments). It drags this case around as it moves. Before pupating, they often climb walls or hang from ceilings.

Generally considered a pest. They do not bite or sting humans, but they can damage clothing, rugs, and upholstery made of natural fibers. They are indicators of high humidity or dusty conditions.