House sparrow nests, composed of twigs, grass, paper, and string, are built in gutters, vents, soffits, lamp poles, on rafters, building ledges, and almost any other conceivable elevated sheltered spot. They also will nest in walls of many structures. Sparrows also can have chicken mites in their nests which can infest buildings. These birds can be eliminated with exclusion work and exclusion products. Baiting can be performed as a last resort.