Well played!
A good thought experiment goes back to the basics and builds up layer by layer to see if a conclusion makes sense.
We can talk in terms of species, or we can talk in terms of kinds, they mean the same thing much of the time but perhaps there are subtleties that differ the two. How do we determine what a "kind" is?
Can we produce one kind from another kind? If a lion and a tiger mate to produce a liger or tigon, is this a new kind? Biblically, where did giants come from? Are they are new kind that emerged from humans? I think there is no escaping the process of speciation (the emergence of new kinds). If you agree, let me know and I'll give you the next set of questions. If not, why not?