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ScA 60S 111102 Flesh-Tearing Piranhas Communicate with Sound
SSS我最爱的科学美国人新闻（自己翻着玩）
Like a pit bull, piranhas will tear the flesh from your bones. Also like a pit bull, they bark. [piranha audio type 1] Kind of.
水虎鱼可以像斗牛犬一样，轻易地从你身上咬下一块。某种程度上说，水虎鱼还可以像斗牛犬一样“咆哮”。
Scientists had known that piranha barked when you pick them up—carefully, of course. But they hadn’t known what these sounds were for. So researchers examined how the vocalizations might correspond with behavior.
Scientists had known that piranha barked when you pick them up—carefully, of course. But they hadn’t known what these sounds were for. So researchers examined how the vocalizations might correspond with behavior.
科学家们发现，当你将水虎鱼拿出水面时可以听到它发出的吠声，别忘了要小心。但科学家们还不清楚，这吠声为何而来。下面就来看看研究人员如何研究，发声与行为的关系吧~
They dropped a microphone into a piranha tank that, at different times, held three groups of 10 fish. They then placed a mussel in to see how the fish competed for food.
They dropped a microphone into a piranha tank that, at different times, held three groups of 10 fish. They then placed a mussel in to see how the fish competed for food.
研究人员将麦克风放入水槽，并将3组水虎鱼（每组10只）依次放入水槽。最后，只放入一只蚌以便观察水虎鱼之间竞争食物的过程。
When the fish faced off, they produced that percussive bark. [piranha audio type 1]
当水虎鱼与对手面对面对峙时，它们会发出急促的吠声。
When they circled one another, they made a softer thud sound. [piranha audio type 2]
如果是处在追逐状态，则会发出较为低沉的吼叫。
A teeth-gnashing [piranha audio type 3] indicated that a piranha was getting pretty ticked off as it chased a competitor.
When the fish faced off, they produced that percussive bark. [piranha audio type 1]
当水虎鱼与对手面对面对峙时，它们会发出急促的吠声。
When they circled one another, they made a softer thud sound. [piranha audio type 2]
如果是处在追逐状态，则会发出较为低沉的吼叫。
A teeth-gnashing [piranha audio type 3] indicated that a piranha was getting pretty ticked off as it chased a competitor.
在追逐竞争者时，水虎鱼也会发出一种牙齿互相撞击的声音，这种声音表明水虎鱼确实被竞争者给“惹恼了”。
The first two sounds are produced by muscles contracting around the fish’s swim bladder. The findings are in the Journal of Experimental Biology. 研究发现前两种声音实际上是水虎鱼的肌肉打击自己的鱼鳔发出的。有关这一实验的结果刊登在了《实验生物学》期刊上。
The first two sounds are produced by muscles contracting around the fish’s swim bladder. The findings are in the Journal of Experimental Biology. 研究发现前两种声音实际上是水虎鱼的肌肉打击自己的鱼鳔发出的。有关这一实验的结果刊登在了《实验生物学》期刊上。
The researchers are now interested in whether piranhas vocalize during mating. But they’ll have to travel to Brazil to study this in the wild—turns out that when it comes to mating in captivity, piranhas say, "no tanks."
现在科学家们又将兴趣放在了水虎鱼在交配时是否发声上。但是要做这个实验，他们不得不跑到巴西的野外，因为水虎鱼不满在被关在水槽里，因此拒绝交配~~
