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In a forest, there are different colored rats, like green rats and dark brown rats.
After a couple of decades, the grass dries up and becomes dirt which becomes more beneficial with the darker brown rats but it becomes a negative with the green rats since they no longer camouflage which makes them easy prey.
Many of the dark green rats have died off while many of the dark brown rats have lived and have greater fitness due to their ability to camouflage with the new environment around them.
After many more decades, the brown rats have become the large majority of the population, while the dark green rats became the minority due to lack of camouflage and them dying but they are still living with only very few still alive.
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