它们没有一套迁徙的模式，不像其他的鲸类——假如夏季北极海冰像预计那样减少而成为现实的话，这就引起了关于它们如何适应未来的问题。
They do not have a set migration pattern, unlike some other whale species - which raises questions about how they may adapt in future, if the projected declines in summer Arctic sea ice materialise.
鱼龙和鲸类的另一点相似在于：不像其他目前存活的卵生爬行类，他们胎生生下后代。
Ichthyosaurs also resembled cetaceans in another way: unlike most living reptiles, which lay eggs, they gave birth to live young.
虽然对关切白鱀豚的存亡可能是太迟了，但是人们对关心鲸类的程度却超出了其他“不是销售热点”的物种。尽管如此，这对生态系统的功能还是至关重要的。
And although it may well be too late for the Baiji, cetaceans receive more attention than less 'marketable' species, that are nonetheless, vital for a functioning ecosystem.
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