Gum trees are my all-time favourite tree. No matter what shape or size, I've not met one yet that I didn't love. Some are tall, elegant and impressive; some have bark peeling off in strips, leaving behind a beautiful patchwork; some are gnarly and full of character... but the one that always makes me smile (and reach for my camera) is the scribbly gum, with its gorgeous squiggly lines. The scribbles are made by the larvae of the Ogmograptis Scribula, the scribbly gum moth, which is harmless to the tree and live only in a few varieties of eucalypts - commonly E.haemostoma, E.racemosa or E.sclerophylla - where the scribbly lines become the most pronounced feature of the tree. The larvae burrow into the new bark and, as the old bark falls away, the feeding trails of the larva are revealed.