🐋Sperm Whales Have Vowels — and the Rules Look a Lot Like Ours

Scientists from Project CETI have discovered that sperm whale clicks contain vowel-like sounds organised by the same structural rules found in human languages — from Mandarin to Slovenian.

A Language We Dismissed as Noise

For decades, researchers studying sperm whale communication focused on the rhythm of their clicks — treating the sounds a bit like Morse code, where the pattern of dots and dashes is the message. This told us something. But it was like studying music by counting only the beats and ignoring the notes.

Project CETI — a multidisciplinary group dedicated to understanding whale communication — has been listening differently. And what they found, published in April 2026, is startling: sperm whale clicks contain vowel-like sounds. Not vowels as we experience them, shaped by tongues and lips, but sounds that behave exactly like vowels, governed by the same structural rules that linguists find in human languages.

What "Vowels" Means for a Whale

In human speech, vowels vary in length, tone trajectory, and the way one vowel subtly borrows colour from the vowel beside it. When we say "input," the "n" shifts slightly because of the "p" that follows. Sperm whale clicks do the same thing. They have long and short versions, rising and falling tones, and they blend into one another in ways that parallel tonal languages like Mandarin or pitch-accent languages like Slovenian.

By mixing and matching these features, whales can generate thousands of possible sound combinations — suggesting a system of communication far richer than anything we previously imagined for any non-human species.

"Before, we focused on the timing between clicks. Vowels add a completely new dimension — like discovering a language has not just rhythm but melody."

What This Changes

This finding does not mean we can translate whale speech. What it does mean is that the gap between "animal communication" and "language" may be narrower than we assumed. Language — with its structure, its rules, its capacity to combine elements into something new — may not be a uniquely human invention. It may be something the deep ocean thought of independently, ninety million years before we arrived.

The phonology of sperm whale coda vowelsGašper Beguš, Maksymilian Dąbkowski, Ronald L. Sprouse, David F. Gruber, Shane Gero · UC Berkeley / Project CETIProceedings of the Royal Society B: Biological Sciences, 293 (2069): 20252994DOI: 10.1098/rspb.2025.2994Published 1 April 2026