Which Animals Can Keep a Beat, and Why It Matters
Moving while music plays is not keeping a beat. The distinction is the whole substance of this research area, and applying it honestly disqualifies almost every video you have been sent.
Short answer: a small number of non-human animals have passed properly controlled tests of synchronisation to an auditory beat. A sulphur-crested cockatoo and a California sea lion are the best documented. Budgerigars have done it with training, and rats show beat-related head movement in the same tempo range humans prefer. The reason anyone cares is that beat keeping was long treated as uniquely human, and the pattern of which species can do it is a clue about what the ability is made of.
What counts as evidence
The bar is higher than it looks. An animal bobbing along to a song might simply be moving at its own comfortable rate while music happens to be playing. To count as entrainment, the movement has to satisfy several conditions:
- Phase locking. The movement aligns with the beat rather than merely occurring at a similar rate.
- Tempo flexibility. When the tempo changes, the movement follows.
- Generalisation. The behaviour transfers to tempi and stimuli the animal has not been trained on, which rules out memorised responses.
Our guide to sensorimotor synchronisation covers the equivalent measures in humans, where the same criteria are used and the same distinction between moving and synchronising applies.
Snowball, and the hypothesis that predicted him
Patel, Iversen, Bregman and Schulz published the case that opened the field in Current Biology in 2009. Their subject was Snowball, a sulphur-crested cockatoo who danced to a pop song. They played tempo-manipulated versions of the same song and analysed his movements frame by frame, finding periods of statistically significant synchronisation across a range of tempi. He did not track every tempo perfectly, and the synchronised stretches were interspersed with unsynchronised ones. But the alignment was there, and it moved with the tempo.
Published alongside it in the same issue, Schachner, Brady, Pepperberg and Hauser tested the prediction behind the excitement. Patel had argued in Music Perception in 2006 that entrainment is a by-product of complex vocal learning: the neural machinery that lets an animal hear a sound and reproduce it vocally provides exactly the tight auditory-motor coupling that beat keeping requires. That predicts entrainment in vocal mimics and nowhere else. Surveying a large body of publicly posted animal videos, Schachner and colleagues found evidence of spontaneous entrainment only in vocal mimicking species.
A decade later, Keehn, Iversen, Schulz and Patel returned to Snowball in Current Biology in 2019 and catalogued the variety of his movements, reporting that the spontaneity and diversity of movement to music are not uniquely human.
The sea lion problem
Then Ronan happened. Cook, Rouse, Wilson and Reichmuth reported in the Journal of Comparative Psychology in 2013 that a California sea lion could keep the beat, in a paper whose subtitle names the difficulty precisely: motor entrainment to rhythmic auditory stimuli in a non vocal mimic.
Ronan was trained with reward to bob her head to a metronome, and she then generalised: she synchronised to tempi she had not been trained on and to music she had not heard. Rouse, Cook, Large and Reichmuth followed up in Frontiers in Neuroscience in 2016 by modelling her behaviour as coupled oscillation, the same framework used for human synchronisation.
California sea lions are not complex vocal learners. The strong form of the vocal learning hypothesis therefore cannot be right as stated. What survives is weaker and more interesting: vocal learning may make entrainment likely to emerge spontaneously, while the underlying auditory-motor coupling can also be assembled in other lineages under the right conditions, including training.
The rest of the evidence
| Species | How it was tested | What was shown | Limits |
|---|---|---|---|
| Sulphur-crested cockatoo | Tempo-manipulated song, frame-by-frame analysis | Significant synchronisation across several tempi | Single individual; synchronised in bouts, not continuously |
| California sea lion | Trained head bobbing, then novel tempi and novel music | Generalised synchronisation in a non vocal mimic | Single individual; extensive training required |
| Budgerigars | Tapping to an audio-visual metronome | Rhythmic synchronisation tapping after training | Trained rather than spontaneous |
| Chimpanzees | Exposure to repeated piano sounds | Rhythmic swaying induced by sound | Swaying is not phase-locked beat keeping |
| Rats | Head movement and auditory cortex recordings | Beat synchronisation strongest between 120 and 140 BPM | Small movement amplitudes; laboratory conditions |
| Many other species | Survey of posted videos | No entrainment evidence outside vocal mimics | Absence of evidence in uncontrolled material |
Hasegawa, Okanoya, Hasegawa and Seki reported the budgerigar result in Scientific Reports in 2011. Hattori and Tomonaga reported rhythmic swaying induced by sound in chimpanzees in PNAS in 2020. Ito and colleagues reported the rat findings in Science Advances in 2022, noting that beat perception and synchronisation between 120 and 140 BPM are common in humans and frequently used in music, and that rats showed both prominent beat synchronisation and auditory cortex activity in that same window.
The rat result is worth pausing on, because it lands on the same number that comes out of human research. Our guide to your internal clock and natural tempo covers why roughly two events per second is the region where human beat perception works best.
What this tells us about ourselves
Wilson and Cook wrote the most quotable summary of the field in Psychonomic Bulletin & Review in 2016, under the title "Rhythmic entrainment: why humans want to, fireflies can't help it, pet birds try, and sea lions have to be bribed." The point behind the joke is serious. Entrainment is not one thing. A firefly's flash synchronisation, a parrot's spontaneous dancing and a trained pinniped's head bobbing are produced by different arrangements, and lumping them together as "keeping the beat" hides the distinctions that matter.
For human rhythm the implication is deflationary in a useful way. Beat keeping looks less like a single faculty that evolution granted us and more like a particular assembly of capacities, several of which exist elsewhere. That fits what we know about the human range too: as our guide to beat deafness describes, some people find the beat with great difficulty, which is hard to reconcile with a universal human module and easy to reconcile with an assembly that can come apart.
A note on reading this literature
Almost every headline case is a single animal. Snowball is one cockatoo, Ronan is one sea lion. Single-subject studies can be perfectly rigorous, and both of these were designed carefully, but they establish that a species can do something rather than that it typically does. Training also matters: a spontaneous behaviour and a rewarded one are different claims about the same species.
None of that undermines the results. It just means the correct summary is narrower than the headlines: several non-human animals have demonstrably synchronised to a beat under controlled conditions, and the set of species that can is broader than the vocal learning hypothesis originally predicted.
Try the task these experiments are built on. Chronspan plays a tempo interval and asks you to reproduce it. Continuation of a heard interval without the stimulus is exactly the measurement used to separate genuine beat keeping from moving at a comfortable rate.
Frequently asked questions
Which animals have been shown to keep a beat?
The clearest cases are a sulphur-crested cockatoo, tested by Patel, Iversen, Bregman and Schulz in Current Biology in 2009, and a California sea lion, tested by Cook, Rouse, Wilson and Reichmuth in the Journal of Comparative Psychology in 2013. Budgerigars and rats have also shown beat-related movement under controlled conditions.
Why did researchers expect parrots specifically?
Because of the vocal learning hypothesis. Patel proposed in Music Perception in 2006 that the brain circuitry supporting complex vocal learning also supports tight auditory-motor coupling, which predicts that entrainment should appear in vocal learners such as parrots and not in other species.
Does the sea lion disprove that hypothesis?
It challenges the strong version of it. California sea lions are not complex vocal learners, yet Ronan learned to synchronise head movements to a metronome and generalised to tempi and to music she had not been trained on. That does not show vocal learning is irrelevant, but it does show it is not a requirement.
Do rats really move in time to music?
Ito and colleagues reported in Science Advances in 2022 that rats showed beat synchronisation in head movement and corresponding auditory cortex activity, and that the effect was clearest between 120 and 140 beats per minute, the same range in which human beat perception is strongest.
Is a dancing pet video evidence of anything?
By itself, no. Repeating a movement while music plays is not entrainment. The test requires that the movement locks to the beat with a stable phase relationship and adjusts when the tempo changes, including tempi the animal has never heard. Most viral videos are never tested against that standard.
What does this tell us about human rhythm?
Mainly that beat keeping is not a single all-or-nothing capacity. Wilson and Cook argued in Psychonomic Bulletin and Review in 2016 that different species entrain for different reasons and under different conditions, which suggests the human version is a particular assembly of more general mechanisms rather than one unique faculty.
Keep reading
- Sensorimotor synchronisation: the human measurements these animal studies are modelled on.
- Beat deafness: the human cases where beat finding does not come for free.
- Neural mechanisms of rhythm: the oscillator accounts used for both humans and sea lions.
Sources: Patel, A. D., Iversen, J. R., Bregman, M. R. and Schulz, I. (2009), Experimental evidence for synchronization to a musical beat in a nonhuman animal, Current Biology; Schachner, A., Brady, T. F., Pepperberg, I. M. and Hauser, M. D. (2009), Spontaneous motor entrainment to music in multiple vocal mimicking species, Current Biology; Patel, A. D. (2006), Musical rhythm, linguistic rhythm, and human evolution, Music Perception; Cook, P., Rouse, A., Wilson, M. and Reichmuth, C. (2013), A California sea lion can keep the beat: motor entrainment to rhythmic auditory stimuli in a non vocal mimic, Journal of Comparative Psychology; Rouse, A. A., Cook, P. F., Large, E. W. and Reichmuth, C. (2016), Beat keeping in a sea lion as coupled oscillation, Frontiers in Neuroscience; Hasegawa, A., Okanoya, K., Hasegawa, T. and Seki, Y. (2011), Rhythmic synchronization tapping to an audio-visual metronome in budgerigars, Scientific Reports; Hattori, Y. and Tomonaga, M. (2020), Rhythmic swaying induced by sound in chimpanzees, PNAS; Ito, Y. et al. (2022), Spontaneous beat synchronization in rats: neural dynamics and motor entrainment, Science Advances; Wilson, M. and Cook, P. F. (2016), Rhythmic entrainment: why humans want to, fireflies can't help it, pet birds try, and sea lions have to be bribed, Psychonomic Bulletin & Review; Jao Keehn, R. J., Iversen, J. R., Schulz, I. and Patel, A. D. (2019), Spontaneity and diversity of movement to music are not uniquely human, Current Biology.