In the wild, Neohirasea maerens inhabits the humid forests of northern Vietnam, where its cryptic coloration and spiny body help it blend seamlessly into leaf litter and undergrowth. These stick insects are nocturnal browsers, emerging at dusk to feed on a variety of native foliage including bramble, raspberry, and other Rosaceae. Their slow, deliberate movements and passive defense strategies—like freezing or dropping to the ground—make them well-adapted to avoiding predators such as birds and small mammals. Eggs are scattered among leaf litter, where they incubate for several months before hatching, continuing the species’ quiet cycle of camouflage and survival.