然而，研究者们发现，食人鱼群集的时候多数情况是防御那些如淡水豚、鳄鱼和大型鱼等掠食者的攻击，而不是进行食物猎取。

However, researchers found that piranha most likely group together as a defense against such predators as river dolphins, caimans and bigger fish, and not to engage in feeding-frenzies.

youdao

然而，研究者们发现，食人鱼群集的时候多数情况是防御那些如淡水豚、鳄鱼和大型鱼等掠食者的攻击，而不是进行食物猎取。

However, researchers found that piranha most likely group together as a defense against such predators as river dolphins, caimans and bigger fish, and not to engage in feeding-frenzies.

youdao