Booklouse

Natural Habitat

Damp, dark areas indoors (e.g., bathrooms, basements, around leaky pipes, old books, stored food) or outdoors on bark, under rocks, and in leaf litter.

Diet & Feeding

Fungi, mold, starch, glue (from books), dead insects, and other organic debris. They do not bite humans or pets.

Behavior Patterns

Nocturnal, prefer high humidity. They are often indicators of moisture problems in a home. They are not known to fly, but some species can jump.

Risks & Benefits

Generally harmless to humans. They can be a nuisance in large numbers and may damage books, documents, or pantry items by feeding on mold and starches. Their presence often indicates high humidity or mold growth within a structure, which can be a risk for human health.

Identified on: 11/16/2025