### Identification The Grand Crested Millipede (*Abacion magnum*) is a masterpiece of biological texture. Reaching lengths of 45–80mm, it is notably long and slender compared to the chunky, cylindrical millipedes most hikers encounter. Its most striking field mark is the series of prominent longitudinal ridges, or "crests," that run the length of its dark brown to charcoal-grey body, giving it a rugged, corduroy-like appearance. Look for a faint, pale stripe tracing the spine and large, triangular clusters of ocelli (simple eyes) that give the head a surprisingly "alert" expression. Unlike the smooth *Narceus* species, *Abacion* feels distinctly sandpapery to the touch.
### Habitat & Range This species is a staple of the Eastern United States, ranging from the Gulf Coast up to the Great Lakes. They are true forest-floor denizens, thriving in mature deciduous woodlands. They are particularly fond of limestone-rich areas; because they require significant calcium to maintain their ornate exoskeletons, you will often find them congregating near rocky outcrops, deep leaf litter, or tucked inside the crumbling "red-rot" of fallen hardwood logs.
### Behaviour & Diet While many millipedes are slow-motion bulldozers, *Abacion magnum* is a sprinter. When uncovered, it scuttles with an agility that can startle an observer. They are primarily nocturnal detritivores, emerging under the cover of darkness to forage. Their diet consists of decaying leaf matter and fungal mycelia, though they are opportunistic scavengers that will occasionally consume dead insects to supplement their protein intake.
### Fascinating Fact If its speed doesn't save it from a predator, *Abacion magnum* engages in chemical warfare. It secretes a defensive fluid containing *p-cresol* from specialized glands. To the human nose, this produces a sharp, medicinal odor reminiscent of coal tar or bitter almonds—a potent "keep away" signal that is highly irritating to small mammals and birds!