According to the literature, Peregrine Falcons and Merlins both nested in tree cavities until the end of the 19th and early 20th centuries when most of the great trees were felled. Now the only falcon that regularly nests in natural cavities is the smallest and most common falcon in North America, the American Kestrel (Falco sparverius). White color to relfect sun/heat. The Amador Kestrel Nesting Box can be installed on any post or pole. Hardware kits and pole sets available in our catalog.