Thanks. Were there signs it was feeding on the Grass, or just hanging around ?
Uresiphita ornithopteralis normally feeds on Fabaceae, see http://lepidoptera.butterflyhouse.com.au/pyru/ornithopteralis.html
Thanks donhe. when I saw it it was travelling up the grass blade but I did not see it eating. I thought this high risk behaviour on its part so I stepped away after taking a quick shot so as not to draw the attention of a bird.