It is often hard for them to find food, so some animals such as mice collect extra food before winter and hide it.

它们通常很难觅食，所以一些动物会在冬天来临前收集额外的食物并储藏起来，例如老鼠。

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Alternatively, small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest predators and can themselves be important predators of songbird nets.

另外，小型哺乳动物，如老鼠和地松鼠是许多水禽捕食者的重要食物，它们自己也可能是鸣禽网的重要捕食者。

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They take many things as food, such as mice, sparrows, frogs, birds'eggs, pests and so on.

它们以许多东西为食，如老鼠、麻雀、青蛙、鸟蛋、害虫等；

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The most common method of producing antibodies has been to take non-human antibodies--from animals such as mice--and alter, or "humanize" them.

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One difficulty with introducing toxins into transgenic animals such as mice is that they may not survive the toxins, in which case they can't produce the antibodies.

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Professor Robin Lovell-Badge, geneticist at the National Institute for Medical Research, said that in reality the number of imported animals such as mice that are used in research is very small because a pair are bred when they are brought into a lab.

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