. . . . . . . "1959-04-01T00:00:00Z"^^ . . "Progne subis" . . "Chrysomelidae" . . "Johnston, R. F. 1967. Seasonal variation in the food of the Purple Martin Progne subis in Kansas. Ibis 109:8-13." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .