### Identification At first glance, you might mistake *Acropteris iphiata* for a stray scrap of white lace caught in the breeze. This elegant member of the Uraniidae family (the swallowtail moths) boasts a wingspan of 25–35mm. Its wings are a luminous, chalky white, etched with incredibly fine, dark grey transverse striations that look like delicate pencil strokes. The most striking field marks are the "tails" on the hindwings—small, pointed projections that mimic the look of a swallowtail butterfly. Look closely at the base of these tails: you’ll find two tiny, obsidian-black spots that act as "false eyes," a clever ruse to divert predators away from the moth's actual head.
### Habitat & Range This species is a gem of East and Southeast Asia, frequently encountered from the temperate forests of Japan and Korea down through the subtropical thickets of Taiwan and Southern China. You’ll find them dancing along the edges of broadleaf forests, in overgrown gardens, and near lowland riverbanks. They favor humid, shaded environments where their host plants—typically vines in the dogbane family (*Apocynaceae*)—thrive.
### Behaviour Unlike most moths that hide until dusk, *Acropteris iphiata* is primarily diurnal and crepuscular. You’ll often spot them fluttering with a frantic, erratic flight pattern during the day. However, their most charming habit is their resting posture. When they land, they flatten their wings completely against the underside of a leaf. By pressing their paper-thin bodies tight against the surface, they eliminate shadows, becoming virtually invisible to any bird hunting from above.
### Diet As adults, these moths are nectar-feeders, visiting small white or pale flowers that match their own ghostly hue. As caterpillars, they are much more specialized. The larvae are voracious consumers of *Metaplexis japonica* and species of *Tylophora*, munching on the foliage of these climbing vines.
### Fascinating Fact Despite their fragile, "butterfly-like" appearance, *Acropteris iphiata* belongs to a lineage of moths that are more closely related to the heavy-bodied "inchworm" moths (Geometridae) than to true butterflies. They are essentially a masterclass in convergent evolution, having independently evolved "swallowtails" to survive the same aerial predators that butterflies face!