Koala Bears & Noah's Ark

Dr. Jackson,

1 - In the Bible there is no mention of any boats until Noah
builds the ark.
2 - If this is so, the only way Noah could
have gotten animals such as kangaroos, and Koalas,
which are indigenous to Australia, on the boat is if
Pangea actually existed before the flood.
3 - How did animals like the Kangaroo and Koala get
back to Australia, and why aren't they perhaps living
where the ark landed.

Payden in OK