Booklouse (psocid)

Humid indoor areas, especially around stored books, cardboard, wallpaper, pantry goods, and window frames; also leaf litter outdoors.

Molds, fungi, algae, microscopic organic debris, and sometimes starch-based residues; they do not bite or blood-feed.

Slow-moving, moisture-dependent insects that often occur in clusters. Populations increase in warm, damp conditions and decline when humidity is reduced.

Harmless to people, pets, and structures, though large numbers can contaminate stored foods or damage collectible materials slightly. They help recycle microscopic organic matter and indicate excess indoor humidity.