过去20年内，225种鸟被列为高濒危物种，仅有32种降为相对低级别的濒危种类。
Over the past 20 years, 225 have been classified as critically endangered species, and only 32 moved to a lower grade of extinction.
过去20年内，225种鸟被列为高濒危物种，仅有32种降为相对低级别的濒危种类。
Over the past 20 years, 225 have been classified as critically endangered species, and only 32 moved to a lower grade of extinction.
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