举例来说，洞穴鱼失去了眼睛，而像绦虫一样的寄生虫则失去内脏。

For instance, cave fish lose their eyes, while parasites like tapeworms lose their guts.

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因为洞穴鱼可能并不需要更少的睡眠——它们需要保持清醒，搜寻更多的食物，毕竟洞穴中食物不仅量少而且难以寻找。

Because the cave fish may not need less sleep-they may need to stay awake to forage more in an environment where food can be scarce and appear unpredictably.

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彩虹鱼找到了那个洞穴。

The Rainbow Fish found the cave.

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