Bats in Buildings
Signs of Roosting

Signs of Roosting


It is usually not necessary to enter an attic, basement or other areas to look for bats in structural voids (the spaces between exterior and interior envelopes of a building). Evidence that bats are occupying voids includes seeing them entering or exiting a roost, staining and guano accumulations near active roost entries, audible roost chatter (high-pitched chirping), a distinct musky odor, or repeatedly finding bats on the ground or roosting on an exterior wall.

CREDIT: Austin Bat Refuge

The size and shape of bat guano differs among bat species, but what all insect-eating bat guano have in common is the presence of shiny insect parts in the droppings, and the dry, crumbly texture. Bat guano can sometimes be confused with gecko, lizard, frog or rodent droppings. Rodent droppings are similar in color and size, but are hard and not easily crushed. Gecko droppings are soft and easily crushed, but pellets are tipped with white uric acid deposits not found on bat guanos.

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