Eleven identified humpback whales have been recorded blowing structured bubble rings directly at boats and swimmers during calm, close encounters, producing 39 rings across 12 separate episodes in multiple ocean basins. The behavior, distinct from the bubble-net feeding and threat displays scientists have long studied, had never been formally documented before. The findings land at a time when researchers are actively testing whether whales can engage in directed communication with humans, raising pointed questions about what these animals intend when they send a ring of air toward a person in the water.
Bubble rings aimed at humans signal something new in whale research
Humpback whales (Megaptera novaeangliae) are well known for producing bubbles. Off the coast of Massachusetts, for instance, groups of humpbacks blow coordinated bubble nets to corral fish, a feeding strategy visible from the surface and described in detail by NOAA’s Stellwagen Bank research program. Individual whales also release bubbles during aggressive encounters or apparent play. What separates the newly documented behavior is its physical structure and social context. The rings are poloidal vortices, spinning toroidal shapes that hold their form as they rise, and they were produced not during feeding or conflict but during close, calm approaches to boats and swimmers.
That distinction matters because it rules out the two most common explanations for humpback bubble production. Feeding nets involve large curtains of air, not discrete rings. Aggressive displays tend to accompany lunges, tail slaps, or trumpet blows. The 12 episodes captured in this study showed whales approaching people quietly and then releasing rings in their direction, a pattern that looks more like deliberate signaling or curiosity than anything in the existing behavioral catalog.
Observers reported that the bubble rings were generally released at relatively shallow depths, often within clear view of people at the surface. In several cases, the rings rose directly beneath swimmers or drifted toward stationary boats, suggesting that the whales were at least aware of human positions when they produced the structures. The rings’ coherence in calm water made them visually striking, lingering long enough for multiple photographs and videos to be captured, which in turn allowed researchers to confirm that the shapes were true vortex rings rather than irregular exhalations.
One testable idea follows from the observations: if the rings function as a directed communicative signal rather than incidental play, then playing back sounds associated with ring production through underwater speakers should prompt whales to increase their ring output compared to control tones. That experiment has not yet been run, but the research team behind the bubble-ring study has already demonstrated the infrastructure to do it. A carefully designed playback protocol could, in principle, vary sound types, timing, and context to see whether whales respond with more rings, different ring sizes, or altered approach behavior.
WhaleSETI’s playback work with a whale named Twain built the foundation
The bubble-ring documentation comes from researchers connected to the WhaleSETI project, a program designed to probe nonhuman intelligence through controlled acoustic exchanges with humpback whales. In a separate peer-reviewed study, the team conducted an interactive playback experiment with an identified Alaskan humpback whale named Twain. That work showed Twain responding to recorded humpback calls played through an underwater speaker, matching the timing and structure of the playback in ways that suggested the whale was treating the exchange as a conversation rather than ignoring it or reacting with alarm.
During the Twain sessions, researchers alternated between periods of silence and bouts of playback, then measured how quickly and how often the whale vocalized in return. Twain’s calls tended to follow the artificial sounds with consistent delays, and the acoustic features of his responses resembled those of the stimuli he heard. This pattern is what led the team to interpret the interaction as turn-taking, a hallmark of conversational behavior in many social animals.
The underlying timing and response data from the Twain experiment are archived in a public dataset, allowing independent researchers to verify the reported interaction latencies. That transparency is relevant to the bubble-ring question because the same playback methodology could be adapted to test whether whales produce rings in response to specific acoustic cues. If a whale like Twain were to blow bubble rings more frequently when hearing ring-associated sounds than when hearing unrelated tones, that would be strong evidence the behavior carries communicative intent.
Researchers involved in WhaleSETI emphasize that they are not claiming to “speak whale” in any literal sense. Instead, they frame their work as an effort to map the rules and constraints of humpback communication, much as linguists might analyze the structure of an unfamiliar human language. The bubble-ring observations add a visual and hydrodynamic element to that map, hinting that whales may use multiple channels-acoustic, tactile, and now possibly bubble-based-to exchange information with one another and to probe novel objects or beings in their environment.
Anatomical research on how humpbacks produce different bubble structures adds another layer. Whales can release air through both nasal and oral pathways, and the type of release determines the shape and size of the resulting bubbles. Poloidal vortex rings require a controlled, focused burst of air, which is mechanically different from the broad exhalations used in bubble-net feeding. The physical effort involved in producing a stable ring suggests the behavior is not accidental and may reflect a learned motor skill, potentially passed socially among individuals that spend time near vessels or divers.
Open questions about intent, frequency, and ocean noise
The 12 documented episodes and 39 rings represent the first formal record of this behavior, but the sample size is small. Researchers do not yet know how common bubble-ring production is across the global humpback population, whether certain individuals do it more than others, or whether it correlates with age, sex, or social context. The study notes that the episodes occurred across multiple ocean basins, which argues against a local quirk, but the total number of identified whales involved, 11, leaves room for the possibility that only a subset of the population engages in the behavior.
No direct quotes from observers describing whale body language during ring production are available in the published record. Field notes on posture, eye contact, or approach speed would help clarify whether the whales appeared to be watching for a reaction from the humans they were targeting. That kind of behavioral detail is standard in primate cognition research but harder to capture underwater with large, mobile animals. Future work could pair high-resolution video with synchronized acoustic recordings to reconstruct each encounter in three dimensions, revealing whether whales adjust their position or ring placement in response to human movements.
Rising ocean noise from shipping, sonar, and construction is steadily degrading the acoustic environment humpback whales depend on. If bubble rings serve a communicative function, they could represent a visual channel that bypasses the noise problem entirely. Alternatively, increased vessel traffic might be creating more opportunities for whale-human encounters, making a rare behavior more visible to researchers simply because more people are in the water with cameras. Separating those two possibilities will require longitudinal data collection across sites with different traffic levels and regulatory regimes, as well as standardized protocols for reporting and archiving bubble-ring events.
Ethical considerations also loom over attempts to study the phenomenon experimentally. Any playback work designed to elicit bubble rings would need to minimize disturbance, avoid conditioning whales to approach vessels in unsafe ways, and comply with local marine mammal protection rules. Researchers will have to balance the scientific value of understanding a potentially new communicative signal against the risk of altering natural behavior in already stressed populations.
For now, the bubble rings directed at humans remain an intriguing, enigmatic signal at the edge of marine science. They hint that humpback whales may be more flexible and inventive in their interactions with unfamiliar beings than previously assumed, extending their complex social repertoire into encounters with us. Whether those rings are invitations, warnings, or simply expressions of curiosity, they underscore how much remains to be learned about the minds moving beneath the surface.
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*This article was researched with the help of AI, with human editors creating the final content.
