Researchers have discovered that northern resident orcas and Pacific white-sided dolphins work together to hunt salmon off the coast of British Columbia — a cooperation never documented before.
Using drones, underwater video, and acoustic tags, scientists observed dolphins moving ahead of the whales like “scouts,” chasing large Chinook salmon through the water. The orcas then followed closely, caught the fish, and shared the catch within their pod. The dolphins fed on leftover scraps, and the whales showed no aggression, which is unusual given how protective they normally are with fresh prey.
Acoustic recordings revealed alternating echolocation between species during dives, suggesting they may even use each other’s sonar cues to better locate fish.
Researchers ruled out simpler explanations — such as dolphins seeking protection or stealing food — because the whales consistently followed the dolphins’ lead. The behavior strongly suggests intentional cooperation.
Scientists now want to determine whether this partnership boosts hunting success for both species. Regardless, the discovery highlights the adaptability and intelligence of both dolphins and orcas, revealing a surprising cross-species alliance in the hunt for salmon.
