I guess then the only "pure" life form is the single-celled bacteria from 3 billion years ago... Please Register or Log in to view the hidden image! There is no such thing as "corruption" in evolution. This is wrong-headed thinking. 1] Wolves are not special perfect creatures. The only measure of a creature - any creature- 's fitness is whether or not it survives its environment. 2] Wolves evolved from proto-wolves during a relative ice age. They evolved traits that helped them survive, such as large size and thick coats. We are not in an ice age now. If the wolves of 20,000 years ago had not adapted and evolved they would have died out from overheating. All life forms evolve. The wolves of today are not the wolves of 20,000 years ago. The fact that we happen to call them wolves does not mean they are any closer to wolves of yore than domestic dogs are. Dogs are thriving in their environment. They are very well adapted to survive. That is the only criterion by which an animal's fitness can be measured.