Rand, you raise another thought. Maybe this's an explanation as to why certain living creatures as well as plants are found only in certain parts of the planet, when they could as easily have existed in other parts. They simply didn't get around to migration to other places before the ocean cut them off and isolated them to their locations.
But that is exactly my point. The question I was raising was how did they get to the places they are now? If the Ark landed in say Africa how did some of the animals get all the way to Australia or North America? And if they did migrate across entire continents (Oceans??) why don't we see kiwi’s (the flightless bird) living in Africa. Wouldn’t we find them all over the places that they migrated through?