Barn Owls are sensitive to disturbance so it's best to place boxes in quiet locations.
Tawny Owls are content to nest in smaller cavities than barn Owls and the designs of the nestboxes reflect this.
Little Owls, stock doves and jackdaws all nest in cavities and do sometimes make use of Owl or kestrel boxes.
Kestrels nest in a range of cavities, usually with an open outlook.
There are 12 species of Owls in South Africa, the most common in Gauteng being the barn Owl and spotted eagle Owl. Barn Owls are highly adapted to nocturnal hunting. They possess morphological characteristics that permit silent flight.
Types of South African Owls you would expect to find in an urban landscape