Subduction Zone
Regular Member
Here we go:
http://evolution.berkeley.edu/evolibrary/article/0_0_0/devitt_02
The ensatina is thought to have moved from the north part of California to the south. As the critter moved south the population evolved. When it hit the central valley of CA the population split and continued to move south. When they met up again they were to different species. They could not breed with each other any longer.
There is also a rather nice video on this particular event:
http://evolution.berkeley.edu/evolibrary/article/0_0_0/devitt_02
The ensatina is thought to have moved from the north part of California to the south. As the critter moved south the population evolved. When it hit the central valley of CA the population split and continued to move south. When they met up again they were to different species. They could not breed with each other any longer.

There is also a rather nice video on this particular event:
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