When an adult female orca grips a lifeless sharp-tail sunfish and an adult male hurtles toward it at speed, the resulting collision does more than produce a loud smack. It shatters the carcass into thousands of digestible pieces that a nearby juvenile promptly begins to eat. That sequence, captured on video in two separate encounters, forms the core of a study published on 22 July 2026 in Frontiers in Ethology.
The observations come from the Gulf of California, a region already known for its rich marine biodiversity and for orcas that display both generalist and specialised feeding habits. In the first event, recorded on 29 July 2024 off San Jose del Cabo in Baja California Sur, Mexico, one orca held the sunfish by its clavus while another accelerated into it. The impact scattered tissue that a juvenile then consumed. The second incident, documented on 7 September 2025 in the channel of Isla Cerralvo, followed a near-identical pattern: one adult steadied the prey, another delivered the high-speed ram, and a calf along with other adults fed on the fragments.
Prey already dead
Crucially, both sunfish were already dead, with their viscera removed before the ramming began. This rules out the behaviour as a killing strategy and points instead to a sophisticated prey-processing technique. Researchers suggest it may help juveniles feed more easily, function as a form of play, strengthen social bonds, transmit learned skills through the group, or simply spread resources more widely. The coordinated timing is striking. As lead author Dr Kathryn A. Ayres notes in the paper, one orca holds the sunfish and releases it just before the second strikes at high speed, causing the tissue to break apart into thousands of pieces.
We propose that this ram-to-fragment behaviour may have multiple functions, including facilitating foraging for juvenile orcas or reflecting play behaviour.
The first event was filmed by one of the authors using a GoPro Hero 10 camera during authorised marine wildlife tourism. The second relied on third-party footage shot with a DJI Osmo Action 5. Both videos provide clear evidence of deliberate, repeatable actions rather than random aggression. The paper, which is open access, lists authors Kathryn A. Ayres of Beneath The Waves, Austin J. Gallagher, Christine V. Avena, Carlos M. Duarte and Jesús Erick Higuera Rivas.
Implications for conservation
These documented cases add another layer to our understanding of orca predatory strategies and cooperative hunting, behaviours already recorded against large prey worldwide. Sharp-tail sunfish can grow beyond three metres and weigh up to two thousand kilograms, yet the orcas treat them with precise mechanical efficiency. The Gulf of California supports orcas that hunt sunfish, devil rays, sharks, sea turtles and various fish, demonstrating remarkable dietary flexibility.
Such complexity in marine predator intelligence reminds us why evidence-based conservation matters. Protecting the diverse ecosystems that sustain these interactions should rest on solid observational data rather than blanket regulations that ignore the economic realities of coastal communities. When we grasp how orcas process prey, teach one another and perhaps even play within their social groups, we gain clearer grounds for policies that safeguard biodiversity while allowing sustainable human activity to continue.
