Booklouse (barklouse)

Humid indoor areas, especially cupboards, stored food, books, and damp or moldy materials.

Feeds mainly on microscopic mold and fungi; may also consume starchy or protein-rich residues.

Small, soft-bodied, wingless insects that crawl among stored materials. They thrive in warmth and humidity and reproduce rapidly when conditions are favorable.

Harmless to people and pets; they do not bite or transmit disease. Large numbers can contaminate stored foods or signal excess moisture and mold.