Tiger Moth - Creatonotos gangis
What you see in this photo is a male of Creatonotos gangis (Arctiidae), a species of Asian moth, showing his expanded pheromone diffuser structures at the tip of the abdomen (called coremata and androconia). The four coremata are reversible, each when inflated may be longer than the abdomen.
Females pheromonally attract males from long distances, however, when the male is close enough to begin his courtship, he inflates his coremata with air or hemolymph to evert externally from the abdomen and fans pheromones of his own towards the female.
This species of moth is found over much of south-east Asia, as well as in Australia.
Photo credit: ©Darren5907 | Locality: unknown (2009)