[tallhappy]

We know that speciation is caused when a single species/group spilts and no longer mates. This can be caused by something as simple as river separating the two populations or one species does not recognize the "mating dance" of the other species.

How long is this supposed to take?

[realpatriot71]

How long is this supposed to take?

In a case of California chipmunks, not more than a few generations. The different species can mate, but do not because the different groups have new matting rituals that the other species does not reognize. Speciation is really a definition of reproductive isolation in the wild.