By mn15, Updated
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Several common rats are washed up on the island shore. The island is an extinct volcano and these rats need to find a way to survive.
What are we supposed to eat?
There's nothing here but fish!
Through mutation, the black rats were able to hold their breaths longer underwater.
Because of this mutation, the black rats were able to catch fish
Only the black rats could get the fish so after some time, most of the grey rats died out
The few that survived were easy to spot from their predator so they died instead of the black rats that camouflaged with the enviornment
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