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A new species can develop in just a few generations. It really depends on the gestation period of the parent species and general length of parenting.
For instance, in the 1970s an area in the UK was isolated by the removal of a bridge, separating the field mice of that area from those surrounding it. Within 18 months, the mice of the isolated area developed into a new species. Divergence of rodent populations can progress fairly quickly due to the very short gestations period (20 days on average) and prolific mating.

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10y ago

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