Household Casebearer (often the larva of the Phereoeca uterella or Tinea pellionella)

Typically found indoors in dry, low-light areas such as closets, under furniture, on carpets, and in garages. They are common in warm, humid climates.

The larvae feed on keratin-rich materials such as wool, silk, fur, hair, and dead insects, as well as spider webs and drier lint.

The larva builds a flattened, pumpkin-seed-shaped portable case out of silk and debris (sand, soil, fibers) which it carries around for protection. It emerges from one end to pull itself along and can turn around inside the case to exit the other end.

Generally harmless to humans (they do not bite or sting), but they can be a household pest. They may damage woolen clothing, carpets, and rugs if left unchecked, though damage is often less severe than other clothes moths.