Plaster bagworm

Found indoors on walls, ceilings, and in dark, undisturbed areas.

Feeds on spider webs, dust, hair, shed skin, and occasionally wool or silk fabrics.

Larvae construct a portable, flattened silk case covered in dust and debris, dragging it along surfaces as they move.

Harmless to humans, though their cases cause cosmetic nuisances; they help control minor indoor debris like cobwebs.