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We are the majority of the population
The snake has a hard time preying for us
There was a rat population living outside of a cave. The population's fur color was mostly brown due to the color of the ground.
There is water and it will be cooler inside of the cave so we can survive
Water snakes were the rat's predators and they would feast on whichever rat they saw first. If the rat had a more noticeable color, then the snake would have an easier time preying on them.
There was always a low population of black rats, as they were always eaten by the snakes.
The bats have a hard time preying for us
One day, there was a drought and the rats could no longer live outside as it was too hot and there was no water available, so they scurried inside of the cave.
Inside of the cave, their predator were bats, and because they could see the lighter colored rats better, the brown rats did not survive while the black rats flourished.
The black rats flourished because they are harder to see due to their environment, while the brown rats were eaten by the bats.