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In a forest, there are different colored beetles such as light green beetle, dark green beetles, and a few brown beetles.
After a couple of decades, the grass dries up and becomes dirt. The green beetles are being easily caught since they are not camouflaging. The predators are hungry.
Many of the light and dark green beetles died out. Many of the brown beetles are alive and have greater fitness due to their ability to camouflage.
After many more decades, the brown beetles are now the majority of the population, the dark green beetles have died out, and the light green beetles are barely living.
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