但是诺亚注意到，鸽子独自栖在树枝上，并没有要说什么，也不打算跟别的动物竞争。

But Noah had noticed that the dove was perched alone on a branch and did not try to speak and compete with the other animals.

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他们开始探索雌性动物竞争时是否产生了这些惊人的武器、角与繁殖力两者之间是否需要相关？

They set out to discover whether female competition accounted for these impressive armaments, and whether there was a trade-off between horns and fecundity.

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为生存而进行的斗争不是发生在战斗中，而是在争夺有限的觅食区和占用没有肉食动物的区域的竞争中。

The struggle for existence occurs not in fights, but in the competition for limited feeding areas and for the occupancy of areas free from meat-eating animals.

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