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- The population of horses has slight variation in spots and color in mane, but they all have the same size and smooth hooves. They are all brown, some have spots and some don't. On the horses that don't have the spots, their mane is darker than the horses with the spots. They live on grassy flatland which is why their hooves are smooth.
- When the males are trying to attract a mate, they do a special dance where they tap their hooves and it makes a sound that attracts the females. Once the female hears the sound and is attracted to it they find them and reproduce with each other.
- Half of the horses climbed over the mountain that divides the east and west sides of the island. They can't figure out how to get back over to the rest of the horses. So now half of the horses live on the east side of the island and half of them live on the west side of the island.
- There was a drought on the west side of the island. It dried out the ground which made it more gravely and rough. The east side remains the same grassy flatland as it was before. This splits the island and will eventually create two different populations over many years and generations.
- Since the west side became more gravely due to the drought, the horses developed larger and more rough hooves to get better traction on the ground. The east side horses remained the same.
- The horses from the west side finally figured out how to get back to the east side, but once they did, they wouldn't reproduce with each other. It became two separate species of horses. Since the ones that came back over from the west side now have bigger and rougher hooves, the sound that they make when they do their dance isn't the same so it doesn't attract the females from the east side, They no longer mate with each other since they are different species now. This is an example of behavioral isolation.
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