Orcas in Mexico’s Gulf of California have been filmed flipping juvenile great white sharks, extracting their livers, and sharing the organ with calves in the pod. The same selective technique has now been documented through drone footage in South Africa, electronic tag records at California’s Farallon Islands, and DNA-confirmed bite wounds on a beached white shark in Victoria, Australia. The appearance of this specialized hunting behavior across three ocean basins, performed by distinct populations, has led researchers to conclude that the skill is spreading through social learning rather than arising independently in each group.
Shark-liver foraging is reshaping predator hierarchies in real time
The immediate consequence of this spreading behavior is a measurable disruption to ecosystems that depend on white sharks as apex predators. At South Africa’s largest white shark aggregation site, carcass forensics revealed selective organ removal consistent with orca predation, followed by a prolonged absence of white sharks from the area. A similar pattern played out at Southeast Farallon Island in California, where researchers used extensive electronic-tag datasets and field surveys to show that even brief orca visits displaced white sharks and altered predation pressure on local seal colonies.
That displacement effect raises a testable question: if pods adopt shark-liver foraging as a regular strategy, will they reduce the time they spend hunting seals in the same season? Existing satellite-tag arrays at known aggregation sites could detect such a shift. If orcas begin treating shark livers as a reliable, high-calorie food source, their hunting patterns would change in ways that ripple through the food web, benefiting seal populations in the short term while removing the top-down pressure that white sharks exert on fish and smaller marine species.
Because white sharks and orcas both target pinnipeds, the emerging pattern resembles a competitive displacement. In years when orcas are present and actively hunting sharks, seals may experience a temporary reprieve from shark attacks, but they also face the direct threat of orca predation. Managers monitoring marine protected areas will need to distinguish between these overlapping pressures when interpreting changes in seal survival or haul-out behavior.
Photo-identified orcas repeat the same technique across years and oceans
The strongest evidence for a learned, transmissible behavior comes from the Gulf of California. Researchers photo-identified individual orcas hunting sharks over nearly two years inside Cabo Pulmo National Park, establishing that the behavior is not opportunistic but repeated and specialized. A group known as the Moctezuma pod was documented attacking juvenile great white sharks, attempting to induce tonic immobility by flipping them, then extracting and sharing the liver among pod members, including calves. The inclusion of calves in the feeding is significant because it mirrors how orcas transmit other foraging innovations to the next generation.
The same region produced a second line of evidence. Between 2018 and 2024, orcas in the southern Gulf of California were recorded preying on whale sharks, the largest fish on Earth, using coordinated predation and targeted liver consumption. The addition of a second shark species as prey in the same geographic area suggests that the underlying skill, immobilizing a large shark and extracting a specific organ, transfers across prey types once a pod has learned it.
Within the Moctezuma pod, repeated observations showed a consistent sequence: approach, flank the shark, flip it to induce temporary paralysis, then bite into the abdominal cavity to remove the buoyant, lipid-rich liver. Calves were seen closely shadowing adults during these attacks and then feeding on pieces of liver, a pattern that parallels how resident orcas in other regions learn to handle salmon or herring schools. Such structured participation by young animals is one of the hallmarks of cultural transmission in cetaceans.
In South Africa, the first aerial footage of orcas hunting and killing great white sharks captured the liver-extraction technique in detail. Drone footage and tag detections from Mossel Bay showed orcas pursuing white sharks, consuming free-floating liver after the kill, and triggering a flight response in surviving sharks that left the area. Separately, in 2023, DNA recovered from bite wounds on a beached white shark in Victoria, Australia, confirmed killer whale predation and selective consumption of the mid-section containing the liver. That finding added a third ocean basin with independent physical evidence of the same behavior.
The parallel to another documented case of orca social learning strengthens the cultural-transmission interpretation. Researchers have shown that orcas learned to steal fish directly from commercial longlines, and that this depredation behavior spread through social learning across individuals and groups. The shark-hunting technique follows the same pattern: a novel foraging strategy that appears in one population and then shows up in others, with calves and younger animals acquiring it through observation and shared feeding.
Gaps in tracking data leave key questions open
Several pieces of the puzzle are still missing. No researcher has yet published focal-follow observations or acoustic recordings that capture the moment of teaching during a shark hunt. The evidence for cultural transmission rests on post-hoc analysis: repeated behavior by photo-identified individuals, calf participation in feeding, and the appearance of the same technique in widely separated populations. Direct observation of an experienced orca coaching a younger animal through the immobilization sequence would be the strongest possible confirmation, but that data does not yet exist.
The long-term population effects on white sharks also remain unclear. While the South African aggregation-site data showed prolonged absence after orca predation events, no multi-year census or stranding records have confirmed whether shark numbers recovered or continued to decline beyond the initial observation window. In Australia, the DNA-confirmed attack documents a single lethal event rather than a sustained pattern, leaving open the possibility that some regions may experience only sporadic predation instead of persistent pressure.
Even in the Gulf of California, where the Moctezuma pod has been observed repeatedly, researchers lack continuous tracking of individual sharks and orcas. Without overlapping tag data, it is difficult to quantify how often shark-liver foraging occurs relative to other prey choices, or how far sharks shift their movements to avoid high-risk areas. Seasonal variability adds another layer of uncertainty: it is not yet known whether orcas target sharks primarily during specific migration windows, or opportunistically whenever encounters occur.
Another open question is how widely this behavior will spread within and between ecotypes. The Gulf of California observations, detailed in a recent case study, involve a small number of photo-identified individuals. It is unclear whether neighboring pods that occasionally overlap in range are beginning to copy the technique, or whether it will remain confined to a few highly innovative groups. Long-term photo-identification catalogs and passive acoustic monitoring could reveal whether vocal clans associated with shark predation expand over time.
For now, managers and scientists are left to work with a patchwork of evidence: drone videos, stomach-content analyses, bite-mark forensics, and scattered tag detections. Each new documented kill adds a data point, but comprehensive assessments of ecosystem impact will require coordinated monitoring across multiple sites and years. As orcas continue to demonstrate their capacity for innovation, the challenge will be keeping pace with behavioral change that can redraw marine food webs in just a few seasons.
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*This article was researched with the help of AI, with human editors creating the final content.
