Bats - School IPM - USU Extension



    Fact Sheet: English, Spanish.


    Big brown bats (USDA Forest Service Southern Research Station Archive,

    Silver hair bat

    Silver hair bat (Larisa Bishop-Boros, Wikimedia Commons)


    Bat exclusion with mesh (M. D. Tuttle, UC Statewide IPM Project)


    • wingspan ranges from a few inches to 17 inches
    • 18 species in Utah

    Nesting Habits

    • caves and mines, tree foliage, hollow trees, cracks in rock cliffs and buildings
    • some live in Utah year-round; some are migratory


    • insects


    • major disruptor to building occupants
    • health hazard: could transmit histoplasmosis and rabies

    IPM Recommendations

    • Do NOT kill bats; they are protected by law!
    • Do NOT seal cracks and crevices when bats and their young are present (late May - late July).
    • Exclude bats: seal exterior cracks, crevices and areas around pipes and electrical that enter through walls.
    • Exclude bats: use netting that allows bats to leave structures but blocks them from re-entering the building.
    • Construct bat boxes as an alternative roosting site.
    • Keep all exterior doors and windows closed.
    • Keep screens in good repair.
    • Avoid leaving gaps in construction where bats can roost.
    • Seal all cracks and crevices where bats may enter a building. This may take great effort and special equipment.
    • Use the presence of guano (bat feces) and grease markings on siding, etc., to find openings that need exclusionary measures taken.
    • Never handle bats with bare hands.