For example, 23% of all mammals and 12% of all birds are Red Listed by the International Union for Conservation of Nature (IUCN), meaning they too are threatened with extinction.
例如，所有哺乳動物的23％和所有鳥類的12％是紅上市由國際自然保護聯盟的（自然保護聯盟），這意味著它們也面臨滅絕的危險。