Researchers have documented a surprising partnership off the coast of British Columbia: northern resident killer whales cooperating with Pacific white-sided dolphins to hunt salmon.
Using drones, underwater video, and acoustic tags, scientists observed dolphins racing ahead as “scouts,” locating Chinook salmon that orcas specialize in catching. The whales then followed the dolphins’ lead, captured the fish, and shared their catch, while dolphins scavenged the leftovers. Remarkably, the whales showed no aggression, despite usually guarding fresh kills.
Acoustic data revealed alternating echolocation clicks from both species during deep dives, suggesting they may even be listening to each other to improve their ability to track prey.
Researchers ruled out simpler explanations such as dolphins seeking protection or hydrodynamic benefits. The consistent pattern of dolphins leading and whales following points toward intentional cooperation, a behavior never recorded between these two species.
The study highlights the adaptability of both animals and raises new questions: Do whales that hunt with dolphins have greater success? And how widespread is this partnership in the Pacific?
What’s clear is that this discovery expands our understanding of the intelligence and flexibility of both dolphins and orcas in the wild.
