N any of various aquatic bugs of the families Notonectidae and Corixidae, having a flattened body and oarlike hind legs, adapted for swimming 仰泳蝽; 划蝽
So they collected water boatmen from a stream and pond in France. They recorded 13 males doing their thing.
于是，科学家们采集了法国一个小溪水域的划蝽，并对 13 只雄性划蝽的行为进行了记录，包括声音大小和身材大小。
Researchers thought some freshwater species might rely on sound because of poor visibility. So they collected water boatmen from a stream and pond in France.
研究者认为由于淡水中能见度低，动物可能会更多的依靠声音。
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