Researchers have documented what appears to be cooperative hunting between northern resident killer whales and Pacific white-sided dolphins off the coast of British Columbia—an interaction not previously confirmed between these two species.

The discovery comes from drone footage, underwater video, and tracking data collected near Vancouver Island. Scientists recorded hundreds of encounters where dolphins and orcas foraged side by side, often diving and moving in unison while searching for Chinook salmon.

During these events, killer whales were seen orienting toward nearby dolphins and following them into deeper waters. Researchers suggest the whales may be taking advantage of the dolphins’ echolocation skills to locate salmon—a prey species too large for dolphins to capture themselves.

Once an orca secured a salmon and tore it into smaller pieces, dolphins frequently fed on the remains. Remarkably, no aggression was observed between the species, despite killer whales being known to prey on dolphins in other regions.

The synchronized movements and repeated interactions point to more than coincidence, hinting at a level of coordination that challenges long-held assumptions about how marine predators interact while feeding.

Scientists propose that the relationship may be mutually beneficial: orcas conserve energy by leveraging dolphin echolocation, while dolphins gain access to a valuable food source and possible protection from being near a top predator.

Still, some experts urge caution, noting that further study is needed to determine whether this represents true cooperation or simply opportunistic feeding by dolphins.

This finding adds to a growing body of evidence that marine mammals display complex, adaptable social behaviours, offering fresh insight into how species may respond to shifting ocean conditions and food availability.

Watch the video here.