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Poulter TC. Sonar Signals of the Sea Lion. Science. 1963;139(3556):753-5doi: 10.1126/science.139.3556.753.
Poulter, T. C. (1963). Sonar Signals of the Sea Lion. Science (New York, N.Y.), 139(3556), 753-5. https://doi.org/10.1126/science.139.3556.753
Poulter, T C. "Sonar Signals of the Sea Lion." Science (New York, N.Y.) vol. 139,3556 (1963): 753-5. doi: https://doi.org/10.1126/science.139.3556.753
Poulter TC. Sonar Signals of the Sea Lion. Science. 1963 Feb 22;139(3556):753-5. doi: 10.1126/science.139.3556.753. PMID: 17829121.
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Science. 1963 Feb 22;139(3556):753-5. doi: 10.1126/science.139.3556.753.

Sonar Signals of the Sea Lion.

Science (New York, N.Y.)

T C Poulter

PMID: 17829121 DOI: 10.1126/science.139.3556.753

Abstract

Tape recordings were made of the underwater noises of captive sea lions swimming in a concrete pool at night. When approaching pieces of fish that were thrown into the water, the sea lions emitted trains of sound signals like those of the bat and the porpoise. A detailed analysis of these noises shows that they meet the criteria of a pulse-modulated sonar system and, in fact, reveal an amazing sophistication so far as echo ranging is concerned.

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