【英语时差8,16】食人鱼

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They aren't very large, but do have a mouth full of razor-sharp teeth and a strong jaw¹. So it may surprise you to learn that piranhas are not the bloodthirsty killers² portrayed³ in films. They aren't even strict carnivores!

Most piranha species are omnivores and scavengers. Their diet is mostly made of insects and other fish, but also plants. During the rainy season when food is plentiful⁴, piranhas eat more plants and insects. But in the dry season when ponds and rivers dry up and food becomes more scarce, piranha turn to meat-eating, usually in the form of other fish. Piranhas occasionally bite humans or other mammals when very hungry or threatened, but serious attacks are extremely rare.

Another common belief is that piranha form large schools for hunting, allowing them to attack larger prey⁵ than a single fish could. However, researchers found that piranha most likely group together as a defense⁶ against such predators⁷ as river dolphins, caimans and bigger fish, and not to engage in feeding-frenzies.

Despite their sharp teeth and nasty reputation, these scavengers really spend their days grazing on different foods in their environment and huddle⁸ together for safety.

So while piranha may not win your hearts with cuddly⁹ good looks, they are probably more victim than vicious.  

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