They say that portraying introduced species as inherently bad is an unscientific approach.

他们说把外来物种描绘成天生的坏物种是一种不科学的做法。

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A bumblebee draws nectar from an Arizona sunflower. Many bumblebee species are in decline, mainly because of habitat loss and likely due to introduced pathogens.

一只大黄蜂正在一株亚利桑那向日葵上吸取花蜜。很多种类的大黄蜂其数量都在减少，这主要归咎于栖息地的丧失和病原体的引入。

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Household cats were introduced in North America by European colonists; they are regarded as an invasive species and have few natural enemies to check their Numbers.

欧洲殖民者向北美洲引入了家猫；家猫被视为入侵物种且几乎没有天敌。

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Stewart Brand, the 78-year-old technologist who came to fame as editor of "The Whole Earth Catalog, " introduced an ambitious plan to recreate extinct species, using DNA from museum specimens.

CNN: Save the planet, then finish high school

Last year's count introduced a few new species to North America, including the exotic purple swamphen, an escapee now breeding in the Florida Everglades.

ECONOMIST: A splendid tradition in its 109th year

On April 30th Mr Alarcon issued an emergency decree to stem the tides of pollution, immigration, illegal fishing and the kind of introduced species that threaten the islands' fragile ecosystems.

ECONOMIST: Galapagos