目前科学家们说他们第一次在普通的九叶穿柳鱼身上找到了动物的这种行为。
Now, scientists say they've found the first animal example of this behavior in a common fish, the nine-spined stickleback.
九叶穿柳鱼根据自己的经验知道饲料箱A有更多的虫子，但是饲料箱调换了位置之后，它们能发现饲料箱B现在的虫子更多。
From their own experience the sticklebacks had learned that feeder A gave more worms, but by watching, they could see that feeder B was now more plentiful.
九叶穿柳鱼根据自己的经验知道饲料箱A有更多的虫子，但是饲料箱调换了位置之后，它们能发现饲料箱B现在的虫子更多。
From their own experience the sticklebacks had learned that feeder A gave more worms, but by watching, they could see that feeder B was now more plentiful.
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