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Not the greatest recording but good enough to make the ID.  According to Evans and O'Brien Flight Calls of Migratory Birds, Common Nighthawks thought to be mostly silent in nocturnal migration. This bird may have been out feeding.  I have heard Common Nighthawks calling as they pass over my house at dusk in May and September.

martinap2@verizon.net

Common Nighthawk recorded on 5-23-07 at 3:52 AM