Orcas have been filmed using a previously unknown hunting technique in which they ram sunfish with such force that the fish explode into fragments. The behavior was documented twice in the Gulf of California, once in 2024 and again in 2025. Researchers believe the orcas may be using this method to make the fish easier for juveniles to eat or as a form of play. The sunfish, one of the largest and heaviest fish in the world, were already dead when the orcas rammed them, suggesting the behavior is not primarily for killing. The findings were published in the journal Frontiers in Ethology.
Orca Behavior and Intelligence
Orcas are known for their complex social structures and specialized hunting strategies. They have been observed using coordinated tactics to hunt seals, sharks, and even juvenile blue whales. The ramming behavior observed in the Gulf of California is the first of its kind, though similar cooperative actions have been noted in other contexts. Researchers speculate that the orcas may be using the ramming technique to fragment the sunfish into smaller, more manageable pieces for consumption, particularly for younger members of the pod. Alternatively, the behavior could be a form of play or social bonding.
Scientific Observations
The first instance of this behavior was recorded by marine biologist Dr. Kathryn Ayres in 2024. In the footage, a female orca holds a dead sunfish by its tail while a male orca accelerates and slams into the fish, causing it to explode. A second incident was filmed in 2025 by herpetologist Héctor Franz. Both events involved a mostly intact fish carcass being left behind, with only the internal organs and flesh being fragmented. The orcas' ability to reach speeds of over 40 km/h in short bursts likely contributes to the explosive impact.
Sunfish as Prey
Sunfish, particularly the sharptail sunfish (Masturus lanceolatus), are among the largest bony fish in the ocean, growing up to three meters long and weighing up to two tonnes. Their unique anatomy, including a pronounced rudder-like tail fin, may make them easier for orcas to grip and target. Researchers note that sunfish are a frequent prey for orcas in the Gulf of California, where they surface to rest and warm up after deep dives.
Broader Implications
The discovery of this new hunting behavior highlights the adaptability and intelligence of orcas. It also raises questions about the ecological impact of such predation on sunfish populations. Further research is needed to determine whether this behavior is widespread among orca populations or limited to specific regions. The findings contribute to the growing body of knowledge about the complex and varied hunting strategies employed by these apex predators.