[autumnraine]

Well, how would a different sub-species of a bird be any different? A finch is a finch whether it has different colors or beak style.

[Caesar Soze]

A quick question for you. If you believe that a population of finches can change into a different "subspecies," what do you think is stopping them from continuing to change into a radically different species? You seem to accept that change occurs, but it seems to me that your theory becomes more complicated if you insist that something stops or reverses the processes of change at the point where speciation (as ill-defined as that is) occurs. Is there some undiscovered factor that puts the brakes on mutations, or have I misread your posts?