I have been reading Charles Darwins Book "The Beginning Of Species" and it has got me thinking. Would it be possible to breed a NEW species of Mammal within a life time? i was thinking about using mice because their breeding cycle is quite short. Does anyone have any knowledge of anyone trying this with Mammals? The Reason that i got to thinking about this is that i breed dogs and in every litter i see large variations let alone the massive variations that are possible after a few generations. I was thinking large variations would be achievable quite quickly if the environment was changed dramatically. Of course the changes would only take place if the mice survived and reproduced with the environment change.