Audubon: How Birders Are Boosting Their Yard Lists While They Sleep

Audubon: How Birders Are Boosting Their Yard Lists While They Sleep. “Nocturnal flight call (NFC) recording is a different kind of birding. It doesn’t require binoculars or even stepping foot outside. Instead, a microphone placed on a roof or wedged into an apartment window allows birders to eavesdrop on migrating birds overhead. On calm, quiet nights, inexpensive microphones are able to record birds calling hundreds of feet in the sky—far beyond the reach of our hearing—and cache their calls on a recording device for later review and identification.”