Hedgehogs are covered in small spines. When they are frightened they often roll up into a ball and keep still Scientists have noticed that a new type of hedgehog is increasing in numbers in cities. These hedgehogs do not roll up. They run away when frightened. The scientists think that genes control this behaviour. Explain how this type of hedgehog may become more common in cities. Use ideas about natural selection – 7618

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1. Hedgehogs that run away are more likely to survive and avoid getting run over. They will reproduce and pass on the gene for running away. Over many generations, running away will become more common in the population.

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