Study
Evolution of vocal learning and spoken language
Jarvis, Erich D.
Science, 2019
Synthesises behavioural, neuroanatomical and genomic evidence on vocal production learning across birds and mammals, comparing the brain pathways involved in songbirds, parrots, hummingbirds and humans, and setting out the case for the trait being a continuum rather than a binary.
- Studied in
- Aves, Mammalia
- Sample size
- comparative synthesis across vocal-learning lineages
Vocal production learning is documented in a small number of distantly related lineages, and the independently evolved brain circuits supporting it share a recurring feature: a direct projection from forebrain to the motor neurons controlling the vocal organ, which is absent in non-learners.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Vocal learning has evolved several times independently, from a shared substrate, and is better described as a graded continuum than as a trait species do or do not have.
How NatureHQ reads it
The paper to reach for whenever a list of vocal learners appears. Two things in it matter for reading anything else. The convergence is genuinely striking — songbirds, parrots, hummingbirds, cetaceans and humans are not close relatives, and the same forebrain-to-motor-neuron shortcut turns up in each. And the continuum argument undercuts the tidy lists: several species sit awkwardly in between, showing limited modification of otherwise innate calls, and whether they count depends on where a line is drawn rather than on a fact about the animal.
- A synthesis, and one that argues a position; the continuum framing is not universally accepted.
- Evidence quality is very uneven across lineages — extensive for songbirds, thin for bats, elephants and pinnipeds.
- Shared circuit features across independent origins can reflect a shared developmental constraint rather than a shared solution.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Vocal learning
Learning to produce new sounds is rare. It turns up in a handful of unrelated groups — songbirds, parrots, hummingbirds, some whales and bats, humans — and each appears to have arrived at it separately.
How birds learn to sing
Young birds do something genuinely like babbling — variable practice that narrows towards a model heard earlier — and that similarity is about how a motor skill is acquired, not about language.
Vocal learning
Learned song runs on a specific, mappable set of brain regions with a direct line to the muscles of the voice box — and the birds that cannot learn song do not have that line.
Parrots
A wild parrot chick develops an individually distinctive call that resembles the calls of whoever raised it — and swapping eggs between nests is what shows it is learned rather than inherited.
Parrots
A parrot copying human speech is doing something genuinely difficult — and copying a sound is a different achievement from knowing what it means.
Vocal learning
Hummingbirds are the third group of birds that learn their sounds — and at least one species carries on changing its song throughout adult life to match its neighbours.
Published by: American Association for the Advancement of SciencePublished in Science or Science Advances (AAAS).
doi.org/10.1126/science.aax0287
Checked against Crossref and OpenAlex on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-02.