Researchers have observed a rare cooperative hunting relationship between white-tailed dolphins and northern resident killer whales off the coast of British Columbia. While killer whales typically prey on dolphins, this study captures them hunting salmon together—a first for their interaction.
The study, led by Sarah Fortune from Dalhousie University, utilized suction tags with cameras and hydrophones to document the whales’ behaviors. The footage showed killer whales diving up to 60 meters to follow dolphins and hunt Chinook salmon. Researchers recorded 258 interactions from August 15 to 30, 2020.
This cooperation may benefit both species. Dolphins may enhance their ability to locate salmon while also protecting themselves from potential threats from other killer whale pods. Although killer whales are prominent predators, some experts argue that dolphins might initiate these interactions primarily for their own safety.
Overall, the findings suggest that these two marine mammals can cooperate despite their traditional predatory behaviors, challenging existing views on their interactions. The study also marks the first use of underwater footage to explore these dynamics among marine mammals.
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