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rough-toothed dolphin -- Steno bredanensis More
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William V Ward
25 Jan 1965 at 11:15

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NOTES: Reference: Slijper, Everhard Johannes, "Whales", translated by A. J. Pomerans, N.Y. Basic Books, 1962. Recorded at the Oceanic Foundation. Porpoise named "Malia." Physical description of sound: Humanoid, thin, high-pitched squeak which has high VU volume. Sounds lighter and higher than other Hawaiian porpoises. Quite different from East Coast porpoise recordings I have heard." Apparent biological purpose of sound: "Humanoid appear conversational. Clicks thought to be for echolocating." Behavior: "swam around in 50' diameter pool looking for fish. Note that no air came out of blowhole while vocalizing, but it contracted. Equipment used: "a 2- transistor, grounded-emitter pre-amplifier was used giving about 12dB boost. Hydrophone does not have level response, being heavy in 2.5-3.5 kc area. Cutoff above 6,000." Recordist notes: "Sea Life Park training pool used. Other species eliminated from tank. Animal did not vocalize until some smelt thrown in. Animal used echo-locating clicks only at beginning and near end of tape. The 15-minute recording session was condensed to above 1 minute. Purpose of recording captive was to have a record of this almost-undescribed species; and to learn its voice so we can recognize it when we record wild animals at sea."Slijper SEAOCEAN TEMPAIR: 20 TEMPWATER: 26

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