I rejoice that there are owls  -  Henry David Thoreau

The cosmopolitan Barn Owl occupies a vast range of habitats from rural to urban, and has lived and raised young comfortably around human activity for centuries. Being a cavity-nester, a lack of appropriate, available nesting cavities often keep Barn Owls away from otherwise perfectly useable foraging habitats. By offering a cavity in the form of a Barn Owl Box, you give a natural pest control operator a place to base its operations.