Study
Contextual and combinatorial structure in sperm whale vocalisations
Sharma, Pratyusha; Gero, Shane; Payne, Roger; Gruber, David F.; Rus, Daniela; Torralba, Antonio; Andreas, Jacob
Nature Communications, 2024
A large annotated corpus of codas from individually identified whales of one Caribbean clan was analysed with machine-learning methods, examining not just each coda in isolation but its timing relative to surrounding codas in an exchange.
- Studied in
- Physeter macrocephalus
- Sample size
- roughly 9,000 codas from an identified Eastern Caribbean clan
Coda structure varies systematically along dimensions the authors name rubato — smooth variation in overall duration — and ornamentation, an extra click added at the end of a coda. These vary with conversational context rather than randomly, and combine with the existing rhythm and tempo categories to yield a far larger inventory of distinguishable coda types than previously recognised.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Sperm whale vocalisation carries combinatorial and context-dependent structure, giving a substantially larger expressive space than the traditional coda catalogue suggests.
How NatureHQ reads it
This is the study behind a wave of "whales have an alphabet" coverage, and the gap between what it shows and what was reported is instructive. What was demonstrated is *structure*: the signal varies along more dimensions than anyone had catalogued, and the variation tracks conversational context rather than being noise. What was not demonstrated, and what the paper does not claim, is that any of it means anything. Finding combinatorial structure is a necessary step towards testing for a communication system with semantics; it is not evidence of one. Birdsong and whale song both have rich combinatorial structure without semantics. The honest position is that the search space has been mapped and the search has not been run.
- One clan in one region; whether the same structure appears elsewhere is untested.
- Context is coded from the surrounding exchange, not from any independently known referent.
- No semantic content is demonstrated or claimed, and no behavioural consequence of a given coda type is established.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Nature PortfolioPublished in a Nature Portfolio journal.
doi.org/10.1038/s41467-024-47221-8
This reference was resolved automatically against Crossref on 2026-08-11.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-11.