Researchers analyzed drone footage, sonar data and acoustic recordings from Brazil, where dolphins graze in herds alongside fishermen. Animals dive to signal humans when to cast their nets.
In the case of cooperation, it turned out that fishermen were 17 times more likely to catch fish, and dolphins were 13% less likely to die. In addition, the animals themselves were hunted by humans. That is, cooperation turned out to be mutually beneficial.
Source: Ferra
