Plaster Bagworm (or Household Casebearer)

Typically found indoors in high humidity environments (like bathrooms and garages), often on stucco, plaster walls, or under spiderwebs. They are common in tropical and subtropical climates like Florida.

Detritivores that feed on old spider webs (and the insects caught in them), wool, hair, lint, dead insect parts, and sometimes fibers from clothing or carpets.

The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, lint, paint chips) which it carries around. It can extend its head from either end of the case to move and feed. They eventually pupate inside this case.

Generally harmless to humans (they do not bite or sting). They are considered a minor household pest because large numbers can be unsightly on walls and they may occasionally damage woolen fabrics or rugs, though they are usually less destructive than clothes moths.