From Prothonotary Warblers and Chimney Swifts to Osprey and Burrowing Owls, many species of birds can be given a better chance to survive and thrive through a little assistance from structures we build—birdhouses, roosting towers, nest platforms, and artificial burrows. For some species, these structures tip the scales back in their favor, reducing declines in populations and restoring species to places they once inhabited.