To investigate, Furnas and his team recorded hermit warbler songs. Lots of them.

为了调查，福纳斯及其团队录制了隐莺的歌声。他们录制了许多首歌。

That's a bird called the hermit warbler. It breeds along the U.S. West Coast.

这种鸟名为隐莺。它在美国西海岸繁殖。

And so this creates a vacuum. And then other hermit warblers singing rival dialects move in into this vacuum.

这就产生了真空地带。之后唱着其他竞争方言歌曲的隐莺进入这个真空地带。

Even though the California Hermit Warblers sing multiple songs, Furnas says that such musical diversity might actually work in the hermit warblers' favor.

尽管加州隐莺会唱多种歌曲，但福纳斯表示，这种音乐的多样性可能对隐莺有利。

And then other hermit warblers singing rival dialects move in into this vacuum.

然后其他唱着敌对方言的隐士莺进入这个真空地带。