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Can an animal evolve an extra limb?
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 | | Some monkeys can use their muscular tail as an extra limb. |
Evolution cannot make an animal suddenly produce an extra limb. It can only modify what already exists to make it do a different job. When birds evolved from dinosaurs they did not acquire a pair of wings in addition to their original four legs. Their front legs had gradually to evolve into wings. The tails of some monkeys have evolved to become prehensile; they can be used to grip branches the way their hands can.
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Previous:
Back
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Book:
1001
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Section:
Nature
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Chapter:
Evolution
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