Household Casebearer (often specifically the Plaster Bagworm or similar)

Typically found indoors in humid climates, often in corners, closets, under furniture, or on stucco walls. They thrive in areas with spider webs or accumulated dust.

Detritivores; they feed on spider webs, old insect skins, wool, hair, and other organic debris found in dust.

The larva constructs a protective, flattened, pumpkin-seed-shaped case out of silk and debris (sand, soil, lint) which it carries around. It can emerge from either end of the case to move or feed.

Generally harmless to humans and pets (they do not bite or sting). They can be a minor nuisance pest in homes because their cases are unsightly on walls, but they may provide a small benefit by eating spider webs and dust.