You can rephrase his example to e.g. wolves and chihuahua as one of the more absurd, but accurate, examples to confirm his point and challenge yours. And the in

You can rephrase his example to e.g. wolves and chihuahua as one of the more absurd, but accurate, examples to confirm his point and challenge yours. And the interesting thing is is that was a crazy fast speciation by artificial selection. Not only does the "ancient population" still exist, but it'd be quite bizarre to suggest that wolves were not extinct, if they did go extinct, because chihuahuas exist. Speciation, even from a direct ancestor, is very much a thing.