Sperm whales have been filmed ramming their massive heads into each other in the open ocean, and researchers say it is the first time this behavior has been captured on camera. Three separate incidents of head-first contact between sperm whales were recorded by drones in the Azores and Balearic archipelagos between 2020 and 2022, according to a peer-reviewed study published in Marine Mammal Science. Lead author Alec Burslem and colleagues at the University of St Andrews described the encounters in detail, raising fresh questions about the social lives of the largest toothed predators on Earth.
Why drone footage of sperm whale headbutting changes the research picture
For centuries, accounts of sperm whales using their heads as weapons existed mostly in maritime lore and literary fiction. Herman Melville built the climax of Moby-Dick around a whale destroying a ship with its forehead, and 19th-century whaling logs occasionally noted aggressive charges. But no scientist had recorded whales deliberately making head-first contact with each other until Burslem’s team flew unoccupied aerial vehicles over social groups in the eastern Atlantic. The three observations, spread across two field sites and multiple seasons, suggest the behavior is not a one-off anomaly but something that occurs in different populations and geographic settings.
The timing of the study’s release, with an early online date of 23 March 2026, coincides with growing scientific interest in how drones are reshaping cetacean research. Traditional boat-based surveys struggle to capture brief, high-energy interactions because engine noise can alter whale behavior and surface observers have limited viewing angles. Drones eliminate both problems. They hover silently at altitude and record from directly above, giving researchers a perspective that reveals body orientation, relative size, and the precise moment of contact. The new work is formally described in a peer-reviewed article that sets out methods, measurements, and video-based interpretations.
That overhead vantage point is particularly important for spotting behaviors that unfold quickly and involve subtle changes in alignment. A surface observer on a pitching boat might see only splashes and rolling backs, while a drone can track the precise angle of a whale’s head, the distance between animals, and the acceleration just before impact. These details allow researchers to distinguish accidental bumps from deliberate ramming and to estimate the forces involved, even when the whales are mostly submerged.
One hypothesis worth testing is whether these headbutting events cluster during periods of high prey density. If whales are competing over food-rich patches, their aggressive or social displays could spike when local productivity is elevated. Overlaying the drone timestamps from the Azores and Balearic sites with concurrent satellite-derived chlorophyll-a data from those same waters would offer a first approximation. No such analysis appears in the current paper, but the raw observation data deposited at an open repository could enable other teams to pursue that question.
What the Azores and Balearic drone data actually show
The study, published as article e70153 in volume 42, issue 2 of the journal Marine Mammal Science, documents three UAV observations in which individual sperm whales oriented toward one another and made deliberate head-first contact. The fieldwork took place across the Azores and Balearic islands between 2020 and 2022, giving the researchers repeated access to known social groups. Each encounter was filmed from above, and the footage was paired with photogrammetry measurements that estimated whale body lengths and the ratio of head size to total body length.
Those measurements matter because a sperm whale’s head can account for roughly a third of its body. The spermaceti organ, a massive oil-filled structure inside the forehead, has long been debated as a possible acoustic lens, a buoyancy regulator, or a battering ram. The new footage does not resolve which function dominates, but it does confirm that whales use their heads in direct physical contact with conspecifics, not just with boats or prey. Burslem noted in the institutional release that the footage “adds detail to what we know about sperm whale social behavior,” a measured statement that reflects how little baseline data exists for this kind of interaction.
The behavioral notes accompanying the video clips describe the context around each event, including the number of whales present, their relative positions before contact, and their movements afterward. In one sequence, two whales approach each other from opposite directions, slow slightly, and then accelerate into a clear, aligned collision of foreheads before separating again. In another, a whale appears to angle its body to intercept a companion that is already swimming on a straight course, suggesting that at least some of the contacts are initiated by a single, clearly acting individual rather than by mutual drift.
Supplementary annotations and raw clips are housed in the OSF repository under DOI 10.17605/OSF.IO/GUDBK, making the evidence available for independent review and re-analysis. The study itself, linked through its formal DOI, details how the team calibrated drone altitudes, corrected for lens distortion, and converted pixel distances into estimates of body length and impact position. Together, these methods allow other researchers to judge whether the recorded motions meet their own criteria for intentional ramming.
Gaps in the headbutting record and what to watch next
Several significant unknowns surround the findings. The paper contains no acoustic data from the encounters, so researchers cannot say whether the whales vocalized before, during, or after contact. Sperm whales produce powerful clicks and codas that carry social information, and any correlation between acoustic patterns and physical aggression would sharpen the interpretation considerably. Without hydrophone recordings synchronized to the drone footage, the behavioral context remains incomplete.
Long-term follow-up on the individual whales involved is also absent. The study does not track whether the same animals engaged in repeated headbutting over weeks or months, or whether the encounters produced visible injuries. That gap makes it difficult to distinguish between competing explanations: dominance contests, play, or some other social function. The footage shows no obvious blood or severe trauma, but without systematic health assessments or repeated identification of the same individuals, it remains unclear whether these impacts carry lasting costs.
Another limitation is sample size. Three documented events, spread across two archipelagos and multiple years, are enough to demonstrate that head-first contact occurs but not enough to estimate how common it is. The authors do not attempt to calculate a frequency of headbutting per hour of observation or per number of whales encountered, in part because drone deployment was opportunistic and weather-dependent. As a result, the behavior could be rare and exceptional, or it could be a routine feature of sperm whale social life that has simply gone unnoticed from boats.
Future work could address these gaps by coordinating drones with arrays of underwater microphones, allowing researchers to match every physical interaction with a detailed acoustic record. Tagging individual whales with temporary suction-cup devices that log depth, acceleration, and sound exposure would add another layer, revealing whether headbutts are preceded by particular dive patterns or by changes in group spacing. Expanding drone surveys to other ocean basins would show whether headbutting is restricted to certain populations or widespread across the species’ range.
For now, the Azores and Balearic footage marks a methodological and behavioral milestone rather than a complete explanation. It confirms that sperm whales sometimes meet forehead to forehead in what appears to be deliberate contact, and it demonstrates that drones can capture such fleeting events with enough precision for quantitative analysis. As additional teams mine the shared datasets and replicate the approach elsewhere, the ramming whales of the eastern Atlantic may turn out to be the first glimpse of a broader, still-unmapped repertoire of social behaviors in one of the ocean’s most enigmatic predators.
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*This article was researched with the help of AI, with human editors creating the final content.
