According to the 2001 edition of BI's Threatened Birds of the World, one bird species in eight worldwide is under threat and can be expected to disappear within the next 100 years.
根據國際鳥盟今年出版的「全球受威脅鳥種名錄」記載：全球每八種鳥類就有一種受威脅，估計在未來一百年內滅絕。