From DVOC's Delaware Valley Birds: "Often seen flying in long loose flocks low over the ocean. Inland mainly in migratio"

© A & J Binns

Courtship call of male Black Scoter. Six to eight males surround a single female and give these wailing calls hopefully to gain her favor. Recorded at Cape May Point on February 29, 2004 {N.B. sound has been altered to filter out surf noise} © Don Jones