"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

田纳西大学生态学和进化生物学教授唐·史密斯说：“只有一小部分外来物种会在新栖息地引发问题。”

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"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

“只有一小部分外来物种会在它们的新栖息地引发问题。”田纳西大学生态学和进化生物学教授唐·史密斯说。

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This is closer to biology, especially with speciation, how two distinct species form from one.

它更接近生物，尤其是物种的形成，也就是一个物种如何形成两个截然不同的物种。

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This asexuality seems to have arisen only once, yet biology recognises about 380 species of bdelloid.

ECONOMIST: Evolution

"We are hopeful that our breeding efforts will be successful this year, and we're encouraged by all the behaviors and hormonal data we've seen so far, " said Dave Wildt, head of the Center for Species Survival at the Smithsonian Conservation Biology Institute.

CNN: Giant panda gets artificially inseminated

Of more than 40, 000 vertebrate species on the planet, the reproductive biology of fewer than 100 (among them humans and most domestic livestock) are known in any detail.

ECONOMIST: Endangered species