Commenting on the find, snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."

密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森对这个发现评价称：“在世界范围内，人们经常会发现和描述新种类的青蛙。”

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Snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."

密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森说：“在世界范围内，人们经常发现和描述新的青蛙种类。”

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Roughly 250 million years ago, in the worst series of mass extinction in Earth's history, almost all species of life simply vanished.

大约2.5亿年前，在地球历史上最严重的一系列大灭绝中，几乎所有的生命物种都消失了。

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There has never been a regime in history that was so single-mindedly devoted to the end of producing that rarest and most difficult species of humanity called simply philosopher.

历史上从没有一个政体,会如此专一地致力于,催生最稀有,最难得的人类物种,即哲学家。

耶鲁公开课 - 政治哲学导论课程节选

To put those numbers in perspective, between 1994 and 2006 the United States Fish and Wildlife Service received petitions to list average of 20 species a year and a total of 1, 374 species have been listed in the 37-year history of the Endangered Species Act.

FORBES: Endangered Species Accord Calls a Truce In The Wildlife Wars

"Because mutations start occurring at regular intervals in these genes as soon as a new species evolves - like the ticking of a clock - we can use them to trace the evolutionary history of a species back to its time of origin, " said Dr Hedges.

BBC: Earth AP

Only humans have it, we evolved it, and we have enjoyed it for much of our species' history.

BBC: Viewpoint: Just what is middle age?