All known human languages display a surprising pattern: the most frequent word in a language is twice as frequent as the second most frequent, three times as frequent as the third, and so on. This is known as Zipf’s law.

Researchers have hunted for evidence of this pattern in communication among other species, but until now no other examples have been found.

In new research published today in Science, our team of experts in whale song, linguistics and developmental psychology analysed eight years’ of song recordings from humpback whales in New Caledonia. Led by Inbal Arnon from the Hebrew University, Ellen Garland from the University of St Andrews, and Simon Kirby from the University of Edinburgh, We used techniques inspired by the way human infants learn language to analyse humpback whale song.

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