You can’t debunk a story that can be propped-up with divine intervention (aka magic).
This is quite true. You can argue that if the Sloth had to leave South America to get to the Ark on time, the "pair" would have had to leave South America before (according to a True Blue Literalist believer) the Earth was actually formed.
You could argue that Koalas could never have gotten from or back to Australia, because they sleep 18 hours a day, and that their food does not even exist in most parts of the world.
The fallback decision is God "magicked" them into the Ark. And using this argument, you could even argue that the ark was a small rowing boat, and that all animal "kinds" could haver been kept in a Petri Dish, and did not have to eat. All was needed was their DNA, and then God simply popped them back to where they belonged. You could also argue that God faked the whole thing and simply convinced the author(s) of Genesis that this really happened. After all, God can do anything, and convincing a budding author that this actually happened would be pretty easy, and save a lot of effort in the short term.
I have never worked out however, why all the "kinds" of animals (bar two or seven, or seven pairs) had to be destroyed for peoples sins. What did the poor bloody Polar Bears, Aardvarks and Tasmanian Tigers do to get murdered? Which two were chosen, and why that pair? And I am not convinced that Ants and Bees sinned to the extent that there were only two of each on the Ark.
I can Magick them into the Ark and home again, I just wonder what God had against animals which were (according to Religionists) no concept of "Sin".
But let's take it literally and let's see...the Ark opens up and two Lions and two Zebra emerge. Nothing for the Zebra to eat - all the grasslands have vanished - washed away by the flood. Two Zebra for the Lions to eat, fairly promply, this happens. Why are there Zebras today?
Norm