This fear mechanism is critical to the survival of all animals, but no one can say for sure whether beasts other than humans know they're afraid.

这种恐惧机制对所有动物的生存都至关重要，但没有人能肯定人类以外的动物是否知道自己在恐惧。

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Some evolutionary psychologists believe that the latter is rooted in the universal fear of animals and an associated attempt to appease the beasts through emulation.

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Kids are less likely to fear wild animals, Willoughby says, and because of their small stature, they are more likely to be bitten in the face or neck, which means the virus can travel to the brain much more quickly.

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The next day the animals' fear of the tone had greatly diminished, indicating that the drug had prevented the old memory from being stored again.

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