Phoebes
These stealthy hunters wait on low tree branches, slowly lowering and raising their tails, then swoop out to snap up insects with loud clicks of their beaks. Phoebes (whose name comes from their characteristic FEE-BE song) feast on everything from flies, mosquitoes, small moths, flying ants, and small beetles to grasshoppers, crickets, and caterpillars.
Because these fearless flyers especially like to swoop down over water to scoop up insects, try using water (a small pool, pond, or water garden) to entice them to your yard. Since phoebes prefer to build their mud-made nests in, on, or around manmade structures, you can attract them by providing a nesting shelf or two under your eaves (located in a quiet spot, away from busy doorways, porches, or decks).