Species endangerment and extinction does not occur at random ecologically.

物种濒危和绝灭不是随机的。

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Their global numbers were duly recorded along with their degree of endangerment, the state of their habitats and details of measures being taken to protect each species.

这些物种的全球数量、濒危情况、栖息地状况以及已采取了何种措施对其进行保护的相关细节不同时期都有记录。

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"Introduced species are one of the principal causes of endangerment for half of endangered species, " says Daniel Simberloff, a professor of ecology and evolutionary biology at the University of Tennessee.

CNN: Fish tale