In this two-minute sound segment, a professor of physics and astronomy describes the communication ability of the blue whale. He says that pitch discrimination with whales is incredibly accurate. The whales produce this call always at exactly four octaves below middle C, based on measurements of 6,000 whale calls. This site is from an archive of a daily radio program called Pulse of the Planet, which provides its listeners with a portrait of Planet Earth, tracking the rhythms of nature, culture and science worldwide and blending interviews and extraordinary natural sound. The site also provides a written transcript of the broadcast.
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