Booklouse (or Psocid)

Found indoors in damp, humid environments like basements, libraries, or bathrooms; also found in stored food products (grains, cereals) and old books or paper

Feeds on microscopic molds, fungi, starch, book bindings, glue, and occasionally stored grains

They do not fly (wingless species are common indoors); they run quickly when disturbed; often found swarming on damp surfaces where mold grows; parthenogenetic reproduction allow populations to grow quickly

Risks: Nuisance pest; can contaminate food; indicators of high humidity/mold issues; can cause allergic reactions in sensitive individuals. Benefits: None significant to humans, though they play a minor role as scavengers in nature