ALLOPATRIC SPECIATION

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We start with the rabbit population. This rabbit population variation is fur color. Some rabbits have brown and some are white.
A flash flood hits and separates the rabbits. On one side, it is a more wintery biome and on the other side, it is more green vegetation biome.
On the more wintery biome, the white rabbits thrive because they are able to blend in and avoid the predation better. This cause the brown rabbits to slowly die off over many generation than the white rabbits because they are more prominent. The rabbits thrive more on this side with the small amount of predation that occurs. 
On the other side, the brown rabbits are thriving with their brown fur that helps them blend into their environment. The white rabbits struggle to survive with the heavy predation on the other side.
Over many many generation and hundreds of years have past, the brown rabbits and white rabbits are different species. The brown rabbits have a lean build with long legs while the white rabbits grow thicker fur to keep them warm.
Finally, after a very long time the two new species meet. They are unable to interbreed and produce healthy, fertile offspring due to barriers called mechanisms of reproductive isolation. So at last we finally have two separate populations that stemmed from one.

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