“完成返回加拿大的整段旅程，帝王蝶可能会经历四到五代。”薛西斯戈灰蝶协会濒危物种项目的负责人萨琳娜·杰普森说道。

"It might take the monarchs as many as four to five generations to complete the journey all the way back up to Canada," says Sarina Jepsen, who directs the endangered species program for the Xerces Society.

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这是摘自杰弗里马森的书《对月亮唱歌的猪》（乔纳森凯普）。

This is an edited extract from Jeffrey Masson's The Pig Who Sang to the Moon (Jonathan Cape).

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英国养犬俱乐部(Kennel Club)的犬类遗传顾问杰夫·桑普森(Jeff Sampson)指出，狗的实际寿命数据也在不断变化。

The true Numbers are moving targets, adds Jeff Sampson, canine-genetics consultant to the Kennel Club in the U.K..

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