Dolphins generate their sound beam with ‘phonic lips’ below the blowhole, one low pitched and the other higher pitched, producing a beam with overlapping pulses. Dr Starkhammar attributes this to “millions of years of evolution”. A better explanation would incorporate the principle of analogy—to which Darwin himself appealed frequently… .

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The article: Dolphin Sonar (Still) Far Better Than Man’s
Bats—sophistication in miniature
Echolocation ‘evolved in the same way’
Deep secrets: cetacean communication
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