Bat Attractant Lure Guano Bat House Attractant is made to help bats find your beautiful bat house! It isn't magic but it is science proven that bats will find a roost or house by sence of smell. By using my Bat House Attractant, you give yourself a much better chance of getting a colony of bats patrolling your property for pesky insects! Bat House Attractant comes in a 2 ounce bottle with a twist top squirt lid for easy application. Just shake the bottle of Bat House Attractant and apply to wooden surfaces. One bottle can treat several bat houses.