Why pinnipeds don't echolocate Schusterman, Ronald J. ; Kastak, David ; Levenson, David H. ; Reichmuth, Colleen J. ; Southall, Brandon L. Abstract Publication: Acoustical Society of America Journal Pub Date: April 2000 DOI: 10.1121/1.428506 Bibcode: 2000ASAJ..107.2256S