Underwater Playback of Their Own Sounds to Leptonychotes (Weddell Seals)

Abstract
Underwater sounds of Leptonychotes weddellii were played back to these seals at McMurdo Sound, Antarctica, 17-19 November 1964. They responded vocally to playback of good fidelity as if another seal were present, but playback of poor quality elicited only silent interest. There were 14 playback events to eight different seals. They lost interest with time and successive playback events had less and less effect.