Progne subis subisEdit
Is the nominate form, with the typical features of the species, breeds in eastern North America.
Song, Ontario, Canada
Progne subis arboricolaEdit
Of the Mexico and the southwestern United States, is distinguished primarily by its nesting habits.
Progne subis hesperiaEdit
Of western mountains is large with females paler on underparts.
Nests, eggs, Juveniles by ageEdit
Progne subis subis, Ontario, Canada