Autumn is usually a good time for immigrant species, but it's the sheer number and diversity this year that's special.

秋季通常都是物种迁入的好时机，但特别的是今年在数量和种类上的陡然增长。

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Typically, these are regions with a rich diversity of species that all face a similar threat to their environment.

通常情况下，这些地区的物种丰富多样，然而今天它们的生存环境都面临着同样的窘境。

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It is also a commendably broad study-covering a diversity of species from parrots to primates.

这也是一项涉及范围广泛、值得赞扬的研究——涵盖了从鹦鹉到灵长类不同物种。

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Understanding the historical sources of the species' genetic diversity had a range of contemporary applications, he said.

BBC: Genetic study finds Ice Age salmon refuge

The reason for all this activity is widely believed to be that because sex produces genetic diversity, it protects a species against environmental fluctuations and, in particular, against parasites.

ECONOMIST: The longest ��headache�� ever

Europe is home to a rich diversity of native mammal species ranging from the small such as shrews and voles, to the large such as wolves and brown bears. to the enormous -- in the case of the 70-ton North Atlantic Right Whale.

CNN: All creatures great, small and disappearing