Tree Swallow
"Despite its name, the Tree Swallow is a bird of open fields, meadows, and marshes, a species that uses trees only for nesting and occasional roosting. And yet its name is fitting, as no other trait has so singularly distinguished this species as its decision of where to nest. Not diligent builders, Tree Swallows must rely heavily on woodpeckers and other species to excavate and abandon tree cavities in which they can raise their own young." Birds of the World
Tree Swallow
"Despite its name, the Tree Swallow is a bird of open fields, meadows, and marshes, a species that uses trees only for nesting and occasional roosting. And yet its name is fitting, as no other trait has so singularly distinguished this species as its decision of where to nest. Not diligent builders, Tree Swallows must rely heavily on woodpeckers and other species to excavate and abandon tree cavities in which they can raise their own young." Birds of the World