They chose these bears because they neither interact with people nor prey on animals that spend any significant amount of time near human settlements.

选择北极熊是因为牠们没有接触人类，也没有猎捕在人类聚落附近的动物。

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These animals shred the prey that fall into the pitcher, and the smaller organisms feed on the debris.

这些动物撕碎掉到水罐里的猎物，而小一些的生物则以残骸为食。

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Go back in history and this was part of our survival repertoire; like most animals, we drew on our sense of smell, when visual information was scarce, to single out prey.

回顾历史，这是我们生存技能的一部分；像大多数动物一样，当视觉信息匮乏时，我们利用嗅觉来识别猎物。

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Small animals often fall prey to the speeding traffic on the highway, while larger animals face other risks.

BBC: Tanzania��s alternative to the Serengeti

The researchers report in the Journal of Animal Ecology that although on the whole big animals are indeed better at handling and killing prey, the largest wolves struggled in the chase.

ECONOMIST: Controlling the size of predators