Through cracks and gaps in walls, floors, and foundations
Under doors and through worn door sweeps
Through gaps around windows and screens
Via plumbing openings around pipes and drains
Through vents, ducts, and utility lines
On grocery bags, cardboard boxes, luggage, and packages
Inside used appliances, furniture, and electronics
Through shared walls in apartments and townhouses
From basements, crawl spaces, attics, and garages
From nearby infested homes, trash areas, and outdoor clutter