首先引起他们注意的是，那些幼年感染过寄生虫的雄鸟叫声要比其它鸟短三分之一，而且开叫也相对较迟。
Their first observation was that the songs of those males that had suffered fleas in early life were a third shorter than those sung by the others.
首先引起他们注意的是，那些幼年感染过寄生虫的雄鸟叫声要比其它鸟短三分之一，而且开叫也相对较迟。
Their first observation was that the songs of those males that had suffered fleas in early life were a third shorter than those sung by the others.
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