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species are placed. The division of the Hirundininae has been the source of much discussion, with various taxonomists variously splitting them into as many as 24 genera and lumping them into just 12. Some agreement exists that three core groups occur within the Hirundininae: the saw-wings of the genus Psalidoprocne, the core martins, and the swallows of the genus Hirundo and their allies. The saw-wings are the most basal

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