sentences:  This swallow avoids heavily wooded or precipitous areas and densely built-up locations.The presence of accessible open structures such as barns, stables, or culverts to provide nesting sites, and exposed locations such as wires, roof ridges or bare branches for perching, are also important in the bird's selection of its breeding range.It breeds in the Northern Hemisphere from sea level to typically , but to in the Caucasus and North America, and it is absent only from deserts and the cold northernmost parts of the continents.