Black File Snake

The Black File Snake is a small, secretive burrowing snake found across parts of East Asia, including China, Korea, and Japan. It belongs to a group of odd-scaled snakes noted for their unusual, rough body texture rather than for any medical significance to humans.

Because of its fossorial habits and drab coloration, it is rarely encountered and poorly known compared to more conspicuous species. It is harmless to humans and lacks any venom delivery system of concern.

• Body uniformly dark brown to blackish, sometimes with a faint iridescent sheen
• Strongly keeled dorsal scales giving a rough, file-like texture (source of the common name)
• Small, cylindrical body with a short tail and a head barely distinct from the neck
• Round pupils and small eyes typical of burrowing species
• Adults remain small and slender, rarely exceeding 60 cm

It is distinguished from similar small dark snakes by the pronounced keeling of its scales and its overall matte, rasp-textured appearance.

Found in moist forested hills and mountainous terrain, typically under leaf litter, logs, and loose soil. It favors humid microhabitats with abundant cover and is most active in the topsoil layer rather than on the surface.

Its range spans parts of eastern China, the Korean Peninsula, and Japan, where it occupies temperate and subtropical woodland habitats.

Primarily nocturnal and fossorial, spending most of its time hidden beneath surface debris rather than actively foraging in the open. It feeds mainly on earthworms and soft-bodied invertebrates encountered underground.

Little is documented about its reproduction, but related species in this family are egg-laying, producing small clutches consistent with their small body size.