Sperm whales may possess a phonetic alphabet similar to human speech

Space · Published 22 October 2026 Swipe more like this →

In short: Deep in the ocean, sperm whales communicate using rhythmic clicks that mirror the building blocks of human language. By applying machine learning to thousands of recordings, researchers have identified a complex system of 'phonetic' elements—vowels, rhythms, and ornaments—that suggest these giants may share a structural logic with our own speech.

The Cetacean Translation Initiative (Project CETI), led by marine biologist David Gruber, is utilizing artificial intelligence to decode the vocalizations of sperm whales. By analyzing 9,000 codas—short bursts of clicks consisting of between three and 40 individual clicks—researchers discovered that these sounds are not random. Instead, they form a 'phonetic alphabet' where specific elements function like human vowels. This suggests that sperm whales may have independently evolved a system for complex communication similar to the way humans developed vowels across diverse languages.

The research identifies four primary building blocks of this whale 'language': rhythm, tempo, rubato (the smooth variation of call duration), and ornamentation (extra clicks added to a sequence). By combining these elements in a combinatorial fashion, whales can construct a vast repertoire of distinct vocalizations. For instance, they systematically modulate the timing and additional clicks based on conversational context, such as when rolling at the surface or preparing for a hunt.

While the discovery is groundbreaking, the exact meaning remains unknown. Some scientists suggest these codas could be building blocks for syllables or sentences, while others, like bioacoustician Taylor Hersh, argue the sounds might function more like music—conveying emotion without specific information. The project aims to use these findings to inspire public and policy support for marine protections, drawing a parallel to how humpback whale songs sparked the 'Save the Whales' movement in the 1970s.

The data used for this study was collected between 2005 and 2018 by recording a clan of approximately 400 sperm whales in the Eastern Caribbean. While the project is currently seeking funding through various means, including cryptocurrency donations to support its growth.

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