A group of orcas in the waters off Baja California Sur has been filmed killing whale sharks, the largest fish species on Earth, using a coordinated hunting technique that targets the sharks’ soft underbelly. A peer-reviewed study published in Frontiers in Marine Science documents four separate predation events between 2018 and 2024, with the most recent attack captured on video on May 26, 2024, near Ensenada de Muertos in the southern Gulf of California. Researchers identified the same adult male orca, nicknamed Moctezuma, at multiple kills, raising pointed questions about whether a single pod has developed and passed down a specialized method for taking down the world’s biggest fish.
A repeated hunting pattern in the Gulf of California
The four documented attacks took place across six years, with events recorded in 2018, 2021, 2023, and 2024, all within the southern Gulf of California. That consistency in location and timing sets this behavior apart from isolated opportunistic kills sometimes observed among marine predators. Photo-identification analysis linked the adult male orca Moctezuma to multiple events, according to the Frontiers report, providing the clearest evidence yet that a specific group of killer whales is returning to the same waters to hunt the same prey species.
The orcas’ technique is strikingly deliberate. Working together, they target the whale shark’s pelvic area, inflicting wounds that cause the animal to bleed out. Once the shark is incapacitated, the orcas extract its lipid-rich liver, a calorie-dense organ that appears to be the primary prize. Senior author Erick Higuera Rivas described the behavior as evidence of “a specialized shark-hunting pod that may have acquired unique skills,” in comments distributed through science press channels. The repeated focus on the liver mirrors patterns seen in other shark-hunting orcas, which often prioritize the most energy-rich tissues.
That interpretation carries weight because it aligns with broader research on cetacean cognition. Killer whales possess some of the most advanced brains among marine mammals, and earlier peer-reviewed work on brain-size evolution in whales and dolphins has shown that sophisticated learned behaviors are well within their cognitive capacity. The Gulf of California pod’s repeated success against whale sharks fits that framework: this is not random aggression but a refined, practiced skill that likely requires memory, coordination, and social learning.
What Moctezuma’s photo-ID record reveals about pod learning
The repeated identification of Moctezuma across multiple kills is the study’s most striking data point. Orcas live in matrilineal family groups, and hunting techniques are typically transmitted from mothers to offspring through observation and practice. If the same adult male appears at kills spanning several years, the logical next question is whether younger members of his pod are learning the pelvic-targeting method by participating in or watching these attacks. In other regions, distinct orca populations are known to specialize on salmon, seals, or even rays, suggesting that cultural traditions can shape diet and behavior over generations.
The study does not yet answer the learning question definitively. The researchers’ photo-ID catalog confirms Moctezuma’s presence but does not include a full roster of every individual present at each event or long-term sighting histories for calves or juveniles. Testing whether vertical transmission is occurring would require comparing acoustic call sequences between encounters and tracking photo-ID recaptures of younger animals observed at future shark kills. That kind of longitudinal data collection is difficult in open-ocean settings, but the geographic concentration of events near Ensenada de Muertos offers a natural study site where recurring visits by the same pod might be monitored more systematically.
The filmed May 2024 attack provides the clearest behavioral record so far. The published figures map out the cooperative assault in detail, showing how multiple orcas coordinated their movements to control the whale shark before delivering targeted strikes. In sequence images, individual whales appear to take on different roles, with some positioning themselves along the shark’s flanks while others move in to bite the pelvic region. No raw video or acoustic recordings from the attack have been deposited in a public repository linked to the study’s digital object identifier, which limits independent analysis of the behavioral mechanics and vocal communication that may have guided the hunt.
Open questions about whale shark populations and orca specialization
Four documented kills over six years may seem like a small number, but whale sharks are slow-growing, late-maturing animals classified as endangered by the International Union for Conservation of Nature. Even modest predation pressure from a skilled pod could matter for local populations, particularly if the behavior spreads to other orca groups or intensifies over time. The Frontiers in Marine Science paper does not include quantitative data on whale shark population effects or injury rates outside the four recorded incidents, leaving that risk difficult to measure. At present, the authors treat the events as rare but potentially significant signals of emerging specialization.
The study also lacks a statistical analysis of strike locations across events. Higuera Rivas and his co-authors describe the pelvic-targeting technique based on observational evidence and post-attack examination of remains, but they have not yet published a formal breakdown showing how consistently orcas aim for the same anatomical region across all four kills. That gap matters because establishing a fixed behavioral pattern, rather than a general tendency, would strengthen the case that this is a culturally transmitted skill rather than an instinctive response to a large, slow-moving prey item. Detailed mapping of wounds and bite marks across more encounters could clarify whether the pelvic area is always the first target or simply the most lethal one when an opportunity arises.
Researchers will likely focus future fieldwork on two priorities. First, expanding the photo-identification catalog for orcas in the southern Gulf of California would help determine whether Moctezuma belongs to a small, resident group or a wider-ranging population that only occasionally visits Baja California Sur. A richer ID database, including dorsal fin profiles and saddle patch markings for calves and juveniles, could reveal family relationships and track which individuals repeatedly appear at shark kills. Second, systematic monitoring of whale sharks in the region, using tagging, drone surveys, and collaboration with ecotourism operators, could document non-lethal injuries and near-miss encounters that never escalate to full predation events.
Another unresolved issue is how this new behavior fits into the broader ecological role of orcas in the Gulf of California. Killer whales already occupy the apex position in the local food web, preying on marine mammals, fish, and other sharks. Adding whale sharks to that menu could alter energy flows if the behavior becomes more common. Because whale sharks are filter feeders that consume plankton and small nekton, increased mortality could, in theory, affect lower trophic levels as well. For now, however, the available data are too sparse to support firm conclusions about ecosystem-scale consequences.
The discovery also raises conservation and management questions. Whale sharks attract tourism revenue in Mexican waters, and encounters with orcas could complicate guidelines for boat traffic and swimmer interactions if predation events occur near popular aggregation sites. At the same time, orcas themselves are protected, and their emerging hunting tradition-if confirmed as cultural-would represent a unique natural behavior that many scientists argue should be preserved and studied rather than disrupted. Balancing the protection of an endangered prey species with respect for the predators’ evolving strategies will require careful, evidence-based policy discussions.
For now, the four documented attacks function as both warning and opportunity. They warn that even a small number of highly capable predators can pose a non-trivial threat to a vulnerable species, especially when those predators appear to be refining and repeating a successful technique. Yet they also offer a rare opportunity to watch culture and innovation unfold in a non-human society. As researchers continue to track Moctezuma and his companions through the Gulf of California, each new sighting may help answer a larger question: how quickly can a single idea-here, a way to flip and disembowel a giant shark-spread through a pod of orcas, and what happens to the ecosystem when it does?
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*This article was researched with the help of AI, with human editors creating the final content.
