Orcas and dolphins hunt salmon together off British Columbia coast

For the first time, researchers have watched orcas and Pacific white-sided dolphins actively cooperating to catch salmon—with the dolphins leading the hunt and the orcas following their lead.

The discovery, documented in Scientific Reports by marine scientist Sarah Fortune at Dalhousie University, upends what we thought we knew about how these apex predators behave. Orcas are typically solitary hunters, fiercely protective of their catch. Dolphins usually keep their distance from the much larger whales. Yet off the coast of British Columbia, the two species have figured out how to work together.

Drone footage, underwater cameras, and acoustic recordings show dolphins acting as scouts, darting through the water to locate salmon that can reach nearly three feet long. The orcas follow closely, catching the fish—and then something unexpected happens. They allow the dolphins to scavenge the scraps. No aggression. No territorial posturing. Just cooperation.

How They're Talking to Each Other

What makes this even more striking is how they're coordinating. The research team detected simultaneous echolocation from both species during hunts, suggesting they're essentially eavesdropping on each other's acoustic signals to get a better sense of where the salmon are. It's like they've learned to read each other's sonar.

Fortune describes the orcas as "deferring to the dolphins in a leadership role" during the hunt. This isn't one species muscling in on another's meal—it's a genuine division of labor. The dolphins are faster, more agile scouts. The orcas are the stronger hunters. Together, they're more successful than either could be alone.

Researchers initially explored other explanations. Maybe the dolphins were seeking protection from the orcas. Maybe they were just hitching a ride by bow-riding the larger whales. But the consistent lack of aggression and the coordinated timing of their movements pointed to something deeper: active choice to hunt as a team.

What This Tells Us

The finding challenges a long-held assumption about orca behavior—that they're lone wolves of the ocean. Instead, it shows how adaptable these animals are, willing to refine their hunting strategy based on what works. It also hints at the sophistication of their intelligence. These aren't instinctive behaviors. They're learned, flexible, and refined through experience.

For dolphins, it suggests similar cognitive flexibility. They're not just opportunistic scavengers tagging along. They're strategic partners, confident enough in their role to lead the hunt.

Marine biologists are now asking deeper questions about what else these two species might be communicating about, and whether similar cooperative hunting happens elsewhere in the ocean. The study has opened a door to understanding just how complex the social and hunting lives of cetaceans really are.

Study on Orca-Dolphin Cooperation - Scientific Reports, 2025