这是非常受欢迎的表演品种，几乎灭绝。一些蜷羽鸡爱好者最近起动了一项饲养计划才使它重新振兴起来。
The breed is very popular for exhibition and was virtually extinct until a handful of enthusiasts recently started a breeding program to revive it.
作者们称引起中世纪瘟疫的品种可能已经灭绝了，但是他们认为进一步的研究可以揭示它是如何进化到一种没那么致命的类型。
The authors argue the version of the disease that caused the medieval plague is likely extinct, but suggest that further study could reveal how it may have evolved into a less virulent strain.
说得更具体点，从古罗马时代以来，在过去的两个世纪里，492个品种中已经有480种灭绝了。
More to the point, 480 of the 492 species made extinct since Roman times have disappeared in the past two centuries.
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