如果不是，哪些科含有比随机分布更多或更少的受威胁物种?。
If not, which families contain more or less threatened species than would be expected by chance?
由于夏季海冰消失，一个环保组织正在寻求将海象列为濒危或受威胁物种。
An environmental group is seeking to list the walrus as an endangered or threatened species because of disappearing summer sea ice.
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.
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