You will usually find bats inhabiting your attic, although they may also roost within the walls or in the basement if there is an entry point. You may hear scratching, flapping, or squeaking noises above your head or within the walls. Bats are essentially defenseless, so these enclosed spaces offer them excellent protection from predators, as well as shelter from rain and cold temperatures.
Deposits of guano, or bat droppings, will accumulate within these dark spaces. You may also find deposits on the ground outside the home or on roof tiles. The small, dark pellets crumble into dust when touched. It is very dangerous to allow guano to accumulate in and around your home. The deposits often lead to fungus growth, which can cause severe respiratory problems. Guano also creates a foul odor and yellow stains on walls and ceilings.