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。
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。
China claims some 47 critically endangered animal species on the red List of threatened species, kept by the World Conservation Union, a voluntary organization of concerned scientists.
中国称约有47种濒危动物在世界保护联盟名单上榜上有名。
Three of the four gorilla subspecies are already considered critically endangered, and the fourth is listed as endangered on the IUCN Red List of Threatened Species.
大猩猩的四个亚种已经有三种被列为极度濒危，而第四种也已经上了世界自然保护联盟（IUCN）发布的濒于灭绝物种红色名单。
Mexico's Santa Catalina Island rattlesnake has been classified as critically endangered on the 2007 IUCN red List.
墨西哥圣塔卡特·莱那岛响尾蛇在2007受威胁物种红色名录中被列为极危动物。
Mexico's Santa Catalina Island rattlesnake has been classified as critically endangered on the 2007 IUCN red List.
墨西哥圣塔卡特·莱那岛响尾蛇在2007受威胁物种红色名录中被列为极危动物。
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