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The caterpillars are different color due to mutations in the gene pool. The light caterpillars are not able to survive as much as the dark colored caterpillars.
The yellow caterpillars struggle to survive due to their inability to camouflage, therefore the bird can eat them.
The brown caterpillars are able to survive more than the yellow ones, therefore the brown ones are able to reproduce more but still they have the yellow caterpillars genes.
Since the brown caterpillars survive longer and reproduce more they will eventually pass on their traits a lot more.
Over production/ struggle to survive
Differential survival and reproduction
Changes in the gene pool
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