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.
动物发出的信号，如鸟类复杂的鸣叫声，往往代价高昂。
Animal signals, such as the complex songs of birds, tend to be costly.
颜色鲜艳的长尾小鹦鹉和大犀鸟也在树枝上叽叽喳喳，倘若竖起耳朵仔细听来，林荫里会传来数百种各色鸟类的鸣叫声，如同从远处传来的一阵喝彩声。
Parakeets and great hornbills decorate the branches. Cup your ears, and the voices of hundreds of other bird species swell from the shadows like a distant crowd cheering.
唐纳德真令人刮目相看！他演唱一支鸟类的鸣叫和树蛙的颤音相结合的曲调，作为压轴戏，然后从树上跳下，落到他的青苔的草坪上。
Donald runs through an impressive repertoire of bird and tree frog trills, then hops down to his mossy mat.
科学家们早就知道，鸟类在不同的环境下的鸣叫是不同的，而市区的鸟是以更高的音调鸣叫。
Scientists have long known that bird songs vary in different settings and that urban songbirds in particular sing at a higher pitch.
这说明，和这个在黎明鸣叫最早的鸟类或其他诸如猫头鹰等在夜间捕食的物种的大眼眶一样，人类也遵循同样的进化趋势。
The work indicates that humans are subject to the same evolutionary trends that give relatively large eyes to birds that sing first during the dawn chorus or species such as owls that forage at night.
现在康奈尔大学鸟类学实验室正在分析这些鸟在光柱中飞行时鸣叫声的录音。
Recordings of flight calls inside the light columns are now being analyzed at the Cornell Lab of Ornithology.
一种生活于水边的与鹬有亲缘关系或类似鹬的鸟类，尤指红脚鹬属的一种鸟，以其大声的鸣叫而引人注意。
Any of several shore birds related to and resembling the sandpipers, especially one of the genus Heteroscelus that is noted for its loud cry.
因为，如果除了那些歌唱得最好的鸟类以外别的鸟都不鸣叫的话，树林将会变得非常寂静。
But when we accumulate it to some extent, we should use the talent we possess, because the woods should be very silent if no birds sang except those who sang best.
因为，如果除了那些歌唱得最好的鸟类以外别的鸟都不鸣叫的话，树林将会变得非常寂静。
But when we accumulate it to some extent, we should use the talent we possess, because the woods should be very silent if no birds sang except those who sang best.
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