Which raptor often utilizes man-made birdhouses for nesting?

The American kestrel is known for its adaptability to various nesting environments, including the use of man-made structures like birdhouses. These small falcons prefer cavities or sheltered areas to lay their eggs, making birdhouses an ideal option, especially in areas where natural cavities may be limited. This behavior demonstrates their flexibility in nesting choices, which is essential for their survival in urban and suburban settings where traditional nesting sites might be scarce.

The other raptors, while they may have their own nesting preferences, typically utilize natural sites such as trees or cliffs rather than man-made structures. This distinction highlights the unique behavior of the American kestrel in adapting to human-modified environments.