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Argema mittrei, the Madagascan comet moth, is one of the most extraordinary silk moths on Earth. Endemic to Madagascar’s eastern rainforests, it is instantly recognisable by its long, ribbon‑like hindwing tails and vivid yellow‑green wings marked with bold eyespots. Males are particularly striking, with tails that can reach 15 cm and a wingspan approaching 20 cm, making them one of the largest moths in the world. Females are broader‑winged and heavier, built for egg production rather than long-distance flight.
 
The species is critically endangered, largely due to the severe loss of Madagascar’s native forest. Despite its size and beauty, the adult moth lives only a few days. Like many giant silk moths, adults cannot feed; their sole purpose is to mate and lay eggs before their stored energy runs out. Females deposit around 100–150 eggs on host plants such as Eugenia and Weinmannia, and the caterpillars feed for roughly two months before spinning a distinctive cocoon with drainage holes — an adaptation to the island’s heavy rainfall.
 
After a long pupal period of five to six months, the adult emerges, completing one of the most dramatic transformations in the insect world. The combination of rarity, beauty and ecological fragility has made Argema mittrei a symbol of Madagascar’s threatened biodiversity.