Most birders experience migration through the birds that arrive, depart, or pass overhead by day — but throughout the night, another migration is unfolding largely out of sight. This presentation will introduce nocturnal flight calls and the recordists who use them to experience and study that hidden movement. We will draw on examples from the Northeast, the history of bird sound recording, and the broader development of NFC monitoring in North America. No technical background is needed: the goal is to open a window onto an extraordinary part of bird life happening above us while most of us are asleep, while showing interested birders where they can go next if they want to listen or record for themselves.

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