Green and Golden Bell Frog (Litoria aurea)
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Not one of my best photos, since it was pouring rain (camera isn't waterproof so had to make it quick) and the habitat all around was just grass (annoying!).
These frogs are big and spectacularly coloured, so were awesome to see. This adult specimen seems to of had a parasite growing inside it, creating the large bulge on its back.
Found in East Gippsland