要知道，现在的南极曾经和南美大陆及澳大利亚大陆是接壤的。
We know that what we now call Antarctica was once connected to both South America and Australia.
在南美大陆，昆虫偏向叮咬哺乳动物，但在加拉帕戈斯它们已习惯吸取爬行动物的血液。
On the mainland of South America, the insects prefer to bite mammals but they have adapted their behaviour to favour reptile blood on the Galapagos.
因此，南美外海岛上的鸟类和植物与南美大陆的鸟类和植物很相似；非洲附近的岛屿也繁衍出了可辨识的非洲生命形式。
So: birds and bushes on islands off the coast of South America resemble South American birds and bushes; islands near Africa are populated by recognizably African forms.
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