Last Saturday at a landcare meeting on biocontrol of vines (from which I concluded that the beetles are useful but not a silver bullet – one more thing to add to the tools against feral vines), this moth (Amerila crokeri) landed on another participant. The bright pink leggings match the bright pink abdomen, which I wasn’t quick enough to capture with my camera but you can see it under the semi-transparent wings.
The bright pink probably advertises that the moth is nasty to eat, so is protective. According to the Coffs Harbour Butterfly House website:
The moth has an amazing “frothing” defence mechanism, shared by other moths of the genus Amerila. When disturbed, it exudes a frothy yellow fluid from glands beside the eyes, and makes a sizzling noise!
There’s a photo on their website of the yellow froth effect. Luckily mine wasn’t disturbed at the time.