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| style="height:20px; width:200px; text-align:center;" |Millions of years ago the '''arctic fox''' had dark fur and lived in the woods. When it snowed they were not very well camouflaged and found it difficult to hunt. [[Variation]] meant some had slightly lighter coloured fur and were able to get more food so they had more [[offspring]].
| style="height:20px; width:200px; text-align:center;" |The next [[generation]] inherited the trait of slightly lighter coloured fur. [[Variation]] meant that some were born with even lighter fur. Those were more likely to survive and have [[offspring]].
| style="height:20px; width:200px; text-align:center;" |In the [[arctic]] [[habitat]] eventually all the foxes with dark fur became [[Extinction|extinct]] and only ones with white fur were left.
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