Within the last 15 years, the northern breeding population of Barn Swallows has been extending it s range southward in Louisiana, Mississippi and Alabama (Stewart 1964, 1965, 1968. HoLmes 1974; Kennedy 1974). In Alabama, Imhof (1975) illustrated that the northern breeding population of Barn Swallows nested throughout the state , except in the Piedmont, the Southeast and the lower tier of counties. (Barn Swallows nesting in lower Mobile and Baldwin Counties are ( from a southern breeding population.) This range expansion of the northern
population has been associated with man’s building activities (bridges, culverts, etc.) in areas of suitable habitat.