In the coastal city of Laguna in Brazil, there is a special fishing team. (A) ____ is made up of fishermen and dolphins (海豚)! They cooperate (合作) to catch fish.
Mauricio Cantor from Oregon State University, US, studied this relationship. As he told Science News Explores, (B) they started to work as a team more than 100 years ago.
"The dolphins are really good at finding fish in dirty water and driving them to the coast," Cantor said. "The fishermen are really good at catching the fish with their nets." Once the fish are caught in the nets, dolphins can move in and get some for themselves. ①
Cantor's study described how fishermen and dolphins give cues (信号) to each other during fishing. When dolphins find fish, they drive them to the coast. After that, they arch (拱起) their backs in front of the fishermen to tell them to get nets ready. ② Fishermen may wait for a long time (C) 如果他们失去最好的机会. Therefore, they should be well-trained to understand the cues from dolphins.
The study found that fishermen are 17 times more likely (可能的) to catch fish by working with dolphins. ③ At the same time, cooperative dolphins have 13 % higher survival rates (生存率) (D) ____ other dolphins.
Human-animal partnerships have been uncommon throughout history. But they give us an idea of how positive our human cooperation can be with nature.
