Household Casebearer (often known as the plaster bagworm)

Typically found inside residential buildings, garages, and sheds, often clinging to walls or ceilings in humid environments.

Larvae scavenge for organic fibers and debris, including spiderwebs, hair, silk, wool, and dead insects.

The larva builds a flattened, spindle-shaped case out of silk and environmental debris (like grit and dust), which it carries as it crawls. It can poke its head out from either end of the case to feed or move. After several stages, it attaches the case to a vertical surface to pupate.

They are considered a minor household pest because they can occasionally damage silk or woolen fabrics. However, they are mostly harmless to humans and are largely a nuisance. They provide a minor ecosystem benefit by cleaning up spiderwebs and dead insect remains.