Usually they stayed awake three to four hours past sunset, with no light exposure other than the faint glow of a small fire that would keep animals away and provide a bit of warmth in the winter.

通常，他们在日落后三到四个小时里仍然清醒着，而且除了用以驱赶野生动物并在冬天聊以取暖的微弱火光之外，他们别无其他光源。

youdao

So it was hard to keep animals away from crops.

VOA: special.2010.04.15

The zoo uses so-called hot wires -- or electrically charged cables -- as training tools to keep animals away from such areas as plant beds.

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To make snares, the poachers tear down the wire fences that keep wild animals away from cattle farms.

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