Signs you have bats: checklist

• Bats seen leaving the roofline, eaves or vents around dusk
• Small dark droppings under eaves, on sills or in the attic that crumble into shiny insect bits (unlike mouse droppings)
• Scratching, rustling or chirping in walls or the attic around dusk and dawn
• Ammonia or musty smell from the attic or a wall
• Brown-black greasy rub marks around a gap, vent or tile edge
• A bat found inside the living space
• Stained ceiling or insulation below a roof gap
• Gaps of about 3/8 inch or more at tile ends, fascia, vents or chimney flashing

Never touch a bat with bare hands. If anyone is bitten or scratched, contact your county public health department (CDFW guidance).