Booklouse (barklouse)

Humid indoor areas, especially stored-food cupboards, books, cardboard, wallpaper, and undisturbed surfaces. They favor warm, damp conditions and microscopic mold growth.

Feeds mainly on mold, fungi, algae, organic debris, and occasionally stored-food residues; it does not bite or blood-feed.

Usually wingless and moves slowly or intermittently across surfaces. Populations can increase rapidly by parthenogenetic reproduction when humidity is high.

Harmless to people, pets, and buildings, with no known disease-transmission significance. Large numbers indicate excess moisture and may contaminate or damage stored paper products and food packaging.