Marine biologists have documented a striking new hunting behavior in orcas, where the marine mammals ram a sunfish with enough force to cause the large fish to explode. The unprecedented footage was captured in the Gulf of California, a region where sunfish, known for coming up from deep water to rest, are a common prey for orcas.
A Gruesome Strategy
Researchers observed a pair of orcas targeting a sunfish, a species that can grow up to three meters long and weigh as much as two tonnes. In one observed instance, after an orca had already killed the sunfish and held its tail fin, another orca accelerated and collided with the fish. The impact was so forceful that it caused the sunfish to rupture, breaking apart into numerous pieces.
This behavior was first documented in 2024 and then again in 2025, both times in the Gulf of California. In both recorded instances, the sunfish was already dead before the forceful ramming occurred. Scientists theorize this could be a novel technique for processing prey, potentially to feed younger members of the pod or to gain nutritional benefits from the fish's thick, rubbery capsule.
Possible Explanations
Dr. Kathryn Ayres, a marine biologist at Beneath The Waves, noted that after the sunfish was fragmented, juvenile orcas began feeding on the smaller pieces. Adults consumed the remaining body parts but left the scattered debris. Ayres suggested that breaking down the sunfish might facilitate the absorption of microbes from its unique microbiome, potentially offering nutritional or immune-boosting advantages. "Orcas often tear apart prey and share it with other members of the group, including calves and juveniles," she stated.
Alternatively, experts propose that orcas, known for their intelligence and complex social structures, might simply be playing with their food. "Orcas are known for playing with their food," explained Dr. Ayres. "They're one of the most iconic marine predators in the world, yet they continue to surprise us."
Marine biologists have previously documented orcas engaging in playful interactions with prey, such as "punting" seals into the air off the coast of British Columbia. Some scientists suggest these behaviors could be a method for teaching younger orcas hunting skills or a form of practice. However, the possibility remains that these intelligent animals engage in such actions simply for entertainment.
Orcas (Orcinus orca) are the largest members of the dolphin family and inhabit oceans worldwide. They are known for their sophisticated hunting strategies, which can include coordinating attacks on large whales and using waves to wash seals off ice floes. Scientists continue to study these adaptable predators, with new hunting and prey-processing techniques being discovered periodically.