Festival
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BIRD CALLS The Prospect Park Alliance and the Audubon Society team up to present the Nocturnal Bird Migration Concert. High-powered microphones are turned to the sky to capture the calls of migratory birds as they fly over the city. Friday, 7 p.m. reception, 9:30 p.m. concert, Prospect Park Audubon Center, 95 Prospect Park West at 5th Street, Prospect Park, Brooklyn, 718-287-3400 ext. 114, $25 general, free for members.