SerpApi.Org
Rare footage of killer whales and Pacific white-sided dolphins apparently hunting side by side has resurfaced online, months after the research behind it was published.
Captured by drone and underwater cameras off the coast of British Columbia, the video shows fish-eating orcas and dolphins moving in coordinated patterns while pursuing salmon. Researchers say the unusual behavior could represent a form of cooperation rarely documented between the two species.
The footage does not show a new encounter. It comes from research led by Dalhousie University marine ecologist Sarah Fortune and published in the journal Scientific Reports on December 11, 2025. Although clips from the study have recently recirculated across social media, the observations were made before the research was released.
Over four days of observation, Fortune and her colleagues recorded killer whales following dolphins on deep dives 25 times, according to Science News. The animals also swam in coordinated formations, with dolphins frequently positioned near the whales' heads.
During every observed interaction between the two species, the orcas were hunting, killing or eating salmon. Dolphins were present during four of the eight occasions when the killer whales shared a catch, and researchers documented dolphins eating leftovers at least once.
Fortune's leading explanation involves echolocation. Both species use sound to locate prey, and the dolphins could function as additional sonar-scanning scouts capable of tracking fast-moving salmon.
"If you have other animals that are also echolocating, able to track elusive prey that's avoiding being eaten, then it could be beneficial to have multiple sonar-scanning animals to help keep track of where that fish is," Fortune told Science News.
The arrangement could benefit both sides. Orcas may use the dolphins' echolocation signals to locate salmon, while dolphins—which cannot swallow an entire adult salmon—may receive scraps from successful kills. Researchers also suggested that remaining near fish-eating orcas could offer dolphins some protection from other killer whale populations that prey on marine mammals.
The footage does not show the orcas attacking the dolphins. Researchers instead describe the behavior as possible cooperative foraging, although they have not established that the animals are intentionally working together.
Some scientists remain skeptical. Michael Weiss of the Center for Whale Research told Live Science that he was "not completely convinced" the interaction was cooperative. Bay Cetology researcher Jared Towers suggested the dolphins could simply be following the whales and stealing scraps.
Fortune has acknowledged that those interpretations remain possible. For now, scientists agree that the interaction is real and unusual, but more evidence is needed before it can definitively be called a hunting partnership.
This version is about 430 words—good for a short, traffic-focused article. Embed the drone video immediately after the second paragraph if you have the official Science News, university or research-team upload.
