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In this forest, there are multiple variations among the two rat breeds living there. One breed is a dark brown, and the other is a light brown. The dark brown breed is harder to see, and it is much faster and more athletic than the light brown breed.
Since the dark brown rats are fast and hard to see, they are harder to be caught by predators. The light brown rats do not blend in and are very slow. So they are easier to see.
One day, a new animal was introduced to the forest. It was an eagle, a predator. This caused chaos among the rats, and caused them all to run away
Most of the lighter-colored rats were eaten since they were fatter and easier to see. They also were slower so the fox could catch them easily. The darker rats blended in with their surroundings, so they survived.
Since the darker rabbits survived better, there were more of them alive. Those rabbits reproduced and became more common since they passed down their genes to their offspring, creating more better adapted, dark brown rabbits, than light brown ones.
Eventually, only the dark rats survived in the forest since they were the best adapted to the environment. The light ones were caught by the eagle. Now, the good traits are passed down from the darker rats to their offspring, showing natural selection.

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