Learn to draw a koala, that very well known and popular Australian animal! You could also draw a gum tree to sit him in.
Learn to Draw a Koala
The Echidna is a bit like a cross between an ant-eater and a hedgehog and lives in Australia. You can learn to draw one with this worksheet.
If the kids like sharks, why not help them learn how to draw their own shark with this step by step instruction sheet?