这意味着衰老的公鸡与生育力旺盛的母鸡之间存在生物进化论冲突。
This implies an evolutionary conflict between ageing roosters and fertile hens.
研究人员采用了四种不同试验找出公鸡与母鸡对繁殖成功率的影响---虽然野外动物的研究存在某些困难。
The researchers used four different experiments to separate out the influence of male and female factors on reproductive success -- something that is difficult to study in wild animals.
起初，我们担心公鸡与母鸡会为争食而打架。
At first, we are worried that rooster and hens and fighting for Food fight.
起初，我们担心公鸡与母鸡会为争食而打架。
At first, we are worried that rooster and hens and fighting for Food fight.
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