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They will tum out to be the second-largest species of birds to become extinct.

它们将成为第二大灭绝的鸟类。

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Octopuses vary greatly in size: the smallest is abort 5 cm long, while the largest species may grow to 5.4m in length.

章鱼大小差异极为显著；最小的只有5厘米长，最大的可能达到5.4米。

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Emperor penguins, the largest species, are unique in that they are the only penguins that breed during the harsh Antarctic winters.

BBC: Emperor penguins face extinction

In many areas, the moon jellyfish swarms are usually accompanied by the largest species in Britain, the lion's mane jellyfish, which has a powerful sting.

BBC: Lion's mane jellyfish

So far Prof Martin's team have faced gale-force winds and blizzards, but with the weather improving they are reported to be ready to resume the largest-ever species eradication project.

BBC: South Georgia rat cull begins again