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That looks like a case-bearing moth larva, commonly called a plaster bagworm or household casebearer. The little elongated “bag” is a portable case made from silk and debris; the larva lives inside it.They’re generally harmless to people and don’t bite or sting. Finding a few on walls usually isn’t an emergency, but they can indicate that the home has suitable food sources such as spider webs, dust, lint, or other organic debris.
If you’re seeing lots of them, vacuuming the cases, removing cobwebs, and reducing humidity can he
