Must have missed the Ark

I’ve never seen a platypus
In Noah’s mighty boat
I didn’t see him try to put
Two wallabies afloat

He had no grey koalas
Climbing up his cabin wall
There’s no sign of goannas
Or echidnas there at all

Yet someone must have saved them
Or they wouldn’t still be here
God must have had a backup plan
For southern hemisphere

It occurs that for this job
That Noah couldn’t do
God must have picked a Koori
In a bloody big canoe