Since then, four species have gone extinct, and the remaining six are all on the IUCN’s critically endangered list.

到目前为止，有四成的老虎已经灭绝了，剩下的六成都列于国际自然保护联盟的极度濒危名单之内。

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Since then, four species have gone extinct, and the remaining six are all on the IUCN's critically endangered list.

到目前为止，有四成的老虎已经灭绝了，剩下的六成都列于国际自然保护联盟的极度濒危名单之内。

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Six of the seven known sea turtle species are listed as vulnerable, endangered, or critically endangered on the International Union for Conservation of Nature's red list of Threatened species.

已知的海龟物种中的七分之六在国际保护受威胁物种联合会的自然红名单上，被登记为脆弱，濒危，甚至极度濒危物种。

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The macaques are critically endangered, according to the IUCN Red List of Threatened Species.

BBC: Devon charity to track endangered macaque

The species, Eulemur cinereiceps, is listed as critically endangered on the International Union for Conservation of Nature (IUCN) Red List.

BBC: Linton Zoo celebrates rare white-collared lemur birth

The species has been listed as critically endangered on the International Union for the Conservation of Nature's Red List of Threatened Species since 1996.

BBC: Earth News - Giant fish 'verges on extinction'