一般提到食人鱼，通常以「红腹食人鱼（Pygocentrus nattereri）作为代表，牠们的特色是满满一口锯齿状的尖锐白牙，且不到 10分钟，食人鱼群就能将一只活牛吃到只剩一排白骨。
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科学家们使用水下麦克风记录了红腹食人鱼在游来游去寻找食物和争夺食物的时候所发出的声音。
Using underwater microphones, the scientists recorded the sounds the fish made as they swam around and competed for food.
《探索发现》频道称，“红腹帕库食人鱼是比拉食人鱼的近亲，比拉食人鱼非常有名，在电视电影中和大银幕电影中让游泳者感到恐怖。”
"The red-bellied pacu is the cousin of a very well-known fish that terrorizes swimmers in made-for-TV movies and on the big screen: the piranha," notes the Discovery channel.
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