There was a population of mice in the artic, with no natural predators. Since there was no natural predators, they did not need to adapt, so they were all different.
Wow life is so good, this place does not have any predators!
So true, we should always stay here!
However, due to global warming, the ice got split and the mice got split up.
Woah, why is the ice splitting!
AHHHH, its splitting! What shall we do!
Due to pure luck, a group of dark colored mice were able to escape and find a island to live on. However, with the island came new problems...
What is this new place, and why are there snakes eating us...
Mice, yummy!
AHHH, LOOK OUT!!!
With the snakes attacking, the mice's numbers quickly declined. However, after a few generations, a sand colored mouse was born.
Stop eating us please!
No, you are delicious!
Wow look, my child is a sandy colored mouse, so weird!
I blend in well, so no snakes are after me.
Since the sandy colored mice was able to blend in, it was able to hide and pass its traits along, so there was more sandy colored mice
These sandy colored mice are so hard to find.
Ahh, I still stand out, the snakes are still after me.
We are all sandy now!
As being sandy colored was a good advantage, after many generations all of the mice were sandy!