An emerald moth.
I photographed this superbly camouflaged emerald moth (Geometridae) in the grounds of the old army base on North Head, Sydney. I don't know what species it is. There are several dozen emeralds in Australia, easily recognisable because of their green colour (more jade than emerald, it has to be said) and their characteristic jizz. Sitting flat and open on leaves like this is how you normally encouter them. You need to be sharp eyed to spot them. They all look rather similar in size, colour and pattern, so identifying them to species level isn't easy. Very similar Geometrids can be seen in Europe.