The majority of psocids are which type?

• A. Outdoor species
• B. Indoor fabric pests
• C. Aquatic pests
• D. Tree-dwelling pests

Answer: (A)

Psocids, often called barklice and booklice, are a diverse group, but most species live outdoors. They’re commonly found on tree bark, leaves, lichens, and other vegetation, where they feed on algae, fungi, and mold on decaying wood. Indoor psocids do occur—booklice that thrive in humid homes on damp moldy surfaces like wallpaper, books, cardboard, and fabrics—but they are only a relatively small portion of the group. Because outdoor habitats are the norm for the majority of psocids, the best answer is outdoor species. The other options point to more specific or limited habitats that don’t capture the overall distribution of psocids.