### Identification The *Eligma narcissus* is a breathtaking example of cryptic evolution paired with "flash" coloration. With a wingspan of 60–80mm, its forewings are a masterclass in camouflage: a sophisticated slate-grey or olive-brown, bisected by a bold, jagged white longitudinal stripe that looks like a splash of white paint. Look for the distinct black "ink spots" peppered along this white band—these are its primary field marks. However, the real drama occurs in flight; the hidden hindwings are a brilliant, warning yellow or bright orange, framed by a thick, charcoal-black border. No other moth in its range combines this specific "skunk-stripe" forewing with such vivid hindwings.
### Habitat & Range This species is a quintessential resident of South and Southeast Asia, ranging from the humid forests of India and Sri Lanka to the temperate woodlands of China, Taiwan, and Japan. You will most likely encounter them in deciduous forests, suburban gardens, and plantations, specifically at elevations where their host trees thrive. They are particularly common in disturbed forest edges where sunlight hits the canopy.
### Behaviour While the adults are nocturnal and frequently drawn to light traps, the larvae are gregarious and impossible to miss. They aggregate in massive, colorful clusters, moving in a synchronized "march" across the bark. If you find an *Ailanthus* tree that appears partially defoliated, look for their remarkable cocoons; they spin incredibly tough, papery, boat-shaped structures that mimic the texture and color of the tree bark with uncanny precision.
### Diet The larvae are specialists, feeding voraciously on the foliage of the *Ailanthus* genus (the "Tree of Heaven"). They are often considered a minor pest in silk production regions because they compete for resources. Adult moths possess a functional proboscis and are known to visit flowering trees at night to drink nectar.
### Fascinating Fact The *Eligma narcissus* is one of the few moths that can "talk" back! When threatened, the adult can produce a distinct, audible clicking or whistling sound by rubbing specialized structures on its body—a process called stridulation. It’s an acoustic defense designed to startle birds and bats in the dark.