So, I wonder how ol' Noah was able to prevent the extinction of the Passenger Pigeon when he only had a pair (or possibly seven) of them.
Supposedly Noah had certain "kinds" of animals from who were able to produce all the other varieties of their own "kind".
ie: From two dogs, came all the varieties of dogs we have now (supposedly).
The whole Noah event was "magical" in the first place and along with your question, raises dozens of other even more scientifically based questions that lead one to conclude that it was only a story.