What materials do you need?

Where to mount bat house?

How will you know that you have new tenants? 

If you don't see bats flying about your bat-house just after dusk, you might want to look around on the ground directly beneath the house for other types of evidence (guano). Bat poop is composed mostly of chewed up insect wings, legs, and bodies—if you drag your foot over the pellets and then look at them in bright sunlight, the material should glitter as the light shines off of all the bug parts!