Thomastoo, here are some possible explanations of your conundrum, drawn up on on Young Earth Creationist (YEC) principles:
(1) At the end of the flood Noah navigated to a point in the water just above Australia, anchored a raft there, and left the marsupials on the raft, which gradually sank with the receding flood waters, depositing the animals where they need to be. Noah did the same for the animals of North and South America, Antarctica, Africa, New Zealand, Papua New Guinea, Greenland and Madagascar (it was a complicated navigational itinerary). The rest of the animals were dispersed by land migration to Europe and Asia.
(2) After the flood, God triggered the Third Law of Accelerated Continental Drift (LACD-3).* The animals migrated from the ark to where they were supposed to be, the continents sped off to where they were supposed to end up, and here we are - QED.
(3) God magically transported all the animals (in suspended animation) through the air to their respective continents.
I hope this helps!
StAnastasia
- I know that law sounds fantastical and made up, but so is everything else in YEC “science.”