No need to guess :-) This is the Common Garden Katydid, Caedicia simplex. Katydids are also known as Bush crickets or Long-horned grasshoppers and belong to the family Tettigoniidae. As you can see it is well disguised as a leaf. It feeds on the leaves and flowers of various plants. In the short video below, it is feeding on the leaves of a Manna Gum, Eucalyptus viminalis.
A short video of the Common Garden Katydid on Mann Gum leaves. (click the Play button)
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