Researchers used computer software to monitor the fish’s movements. They found that after such a long break the fish still went to the same place where they first got food. This suggested that they could remember their past experiences.

　　In fact, scientists had been thinking for a long time that African cichlids might have a good memory. An earlier study showed that they behaved aggressively in front of certain fish, perhaps because they remembered their past “fights”. But until the latest findings, there was no clear evidence.

　　Just as a good memory can make our lives easier, it also plays an important part when a fish is trying to survive in the wild.

　　“If fish are able to remember that a certain area contains safe food, they will be able to go back to that area without putting their lives at risks,” lead researcher Trevor Hamilton told Live Science.

　　For a long time, fish were placed far below chimpanzees, dolphins and mice on the list of smart animals. But this study has given scientists a new understanding of their intelligence.

　　What is the article mainly about?

　　Fish having very bad memories.

　　Fish being smarter than we thought.

　　How fish improve their memory.

　　What we can learn from fish.

　　According to the article, people used to believe that _______.

　　fish could only remember part of their past experiences

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