Used to be called 'Breda jovialis' Estimated 10% of the prey size. Perfect attack site. Bite 'n hang on ! Found under pavilion eaves. Yet to search for prey ID
Reminds me of the weasel on the woodpecker.
Huge numbers of these fish in Sanatorium Lake, Mt Macedon. They are swarming in the shallows.
They appear to be the introduced Mosquito Fish (Gambusia spp.) and if so are a threat to native fish, frogs etc.