证据表明，莺主要用它们极其精致的歌声吸引雌性，这清楚地证实了雌雄间选择对鸟类鸣叫进化的影响。
The evidence suggests that warblers use their extremely elaborate songs primarily to attract females, clearly confirming the effect of intersexual selection on the evolution of birdsong.
鸟类鸣叫是其种相特征之一。
鸟类鸣叫的复杂程度和发声控制神经核团的体积呈相关性。
There is correlation between the volume of nuclei and the complexity extent of call.
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