生物钟控制动物吃东西、睡眠及繁殖的时间：生物钟有助于动物适应四季的变化，这一点极其重要。

This clock governs when an animal eats, sleeps and reproduces: it is hard to overstate how important it is at helping animals adapt to changing conditions throughout the seasons.

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专家说所有幸存的动物以及它们繁殖的后代都是野生的，为了避免它们的数量每年双倍的增加，这些动物都会被细致的管理控制宰杀。

Experts say all the surviving animals and their descendants are now wild, and to avoid the population doubling every year the animals are subject to a carefully managed cull.

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就像收获庄稼一样，野生动物有时候也必须被“收获”，通过允许有限的捕猎，好的管理部门能控制某些物种，使它们不至因过度繁殖而威胁到栖息地。

Just as crops are harvested wildlife too must sometimes be "harvested". By allowing limited hunting, good management can control certain species that threaten to overpopulate their habitat.

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