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2016-3-1 UPDATE
Bottlenose Dolphin
They communicate with each other using sounds and ultrasound waves
Dolphins have well developed sense organs. In addition to sharp underwater vision, they use their familiar echolocation technique to bounce ultrasonic sound off objects to ascertain their surroundings. And ultrasound isn’t their only trick.
Dolphins frequently make short “clicking” sounds that are considered to be a form of language between individual dolphins. [5’41″/Subtitles: Japanese, English]
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