The formal gentleman of the New Zealand lichen world. A moth that dresses for dinner. The footman moth has a slender, elongated silhouette and a silky wing texture. Their anatomy is a masterclass in niche elegance, featuring narrow wings that they wrap tightly around their bodies at rest, mimicking the very twigs and stony surfaces they inhabit. A moth that disappears when it lands. Several indigenous varieties sport delicate highlights of orange or yellow along the wing margins. These stewards of the stone possess a highly specialised metabolism. Larvae feed almost exclusively on lichens and algae, organisms that are notoriously tough and slow-growing. A moth that eats what others cannot. By occupying this difficult nutritional niche, they have claimed a part of the forest that few other insects can exploit. The life cycle is a definitive biological green light for the health of the local atmosphere. Because their primary food source, lichen, is exceptionally sensitive to air pollution, their presence indicates a clean-air environment. A moth that is a sign of clean air. The larvae do more than just graze. They often sequester the lichen's complex chemical defences, incorporating these bitter compounds into their own tissues to deter predators. This strategy represents a state of dignity and specialisation, where a delicate, elegant life is sustained by the most rugged of surfaces. They illustrate the hidden layers of the bush. A simple, lichen-covered rock is actually a high-stakes, multi-species habitat for a resident that has mastered the art of survival on the edge. The rock is grey. The lichen grows. The footman moth lands, wraps its wings, becomes a twig. It does not know it is elegant. It does not know it is a sign of clean air. It just wants to eat lichen. That is what footman moths do.