[AmericanAge]

"How did the koalas survive on the ark?"

Eucalyptus plants are pretty hardy, if you've ever grown one. They can grow in all kinds of climates as well - I know someone from Peru who mentioned that her family would smoke food with them in Peru, and I have one growing right down the street here. It wouldn't be hard at all to have several trees (of the different species for the different Koala species) potted and brought on board.

[Doctor Stochastic]

Just remember, koalas need an entire forest. Single plants are not sufficient.