A fishing community in southern Brazil has an unusual ally: wild dolphins.
Accounts of people and dolphins working together to hunt fish go back millennia, from the time of the Roman Empire near what is now southern France to 19th century Queensland, Australia. But while historians and storytellers have recounted the human point of view, it's been impossible to confirm how the dolphins have benefited — or if they've been taken advantage of — before sonar and underwater microphones could track them underwater.
“This is really incredible cooperative behavior,” she added. “By working with the dolphins," the people catch more fish,"and the dolphins are more successful in foraging, too.” The researchers used sonar and underwater microphones to track the positions of the dolphins and fish, while drones recorded the interactions from above, and GPS devices attached to residents’ wrists recorded when they cast their nets.
“These dolphins and humans have developed a joint foraging culture that allows them both to do better,” said Boris Worm, a marine ecologist at Dalhousie University in Halifax, Canada, who was not involved in the research.
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