Overview
The Common Sharp-tailed Snake (Contia tenuis) is a diminutive, highly secretive woodland reptile native to the moist coastal forests and oak woodlands of the Pacific Northwest. Named for the conspicuous, sharp thorn-like spine at the very tip of its tail, this harmless, pencil-thin snake is an extraordinary dietary specialist that feeds almost exclusively on slippery forest slugs, using specialized needle-like teeth to grasp slimy prey.
Biology and Physical Characteristics
Contia tenuis has a slender, cylindrical body covered in smooth, glossy scales colored reddish-brown, grey-tan, or olive, often accented by faint dark lines along the flanks. Its underside reveals a stunning piano-key pattern: clean white to cream belly scales boldly barred with alternating jet-black crossbars. Its tail terminates in a sharp, pointed, conical scale that is rigid and thorn-like.
Behavior and Ecology
A semi-fossorial forest resident, the Sharp-tailed Snake is adapted to cool, wet conditions, becoming active during cool autumn and spring rains when slugs are abundant, and retreating deep into subterranean rock talus or rodent burrows during dry summer months. When capturing slimy, struggling slugs, it anchors its body by pressing its sharp tail thorn into the soil or logs for leverage.
Conservation and Human Impact
Classified as Least Concern by the IUCN, the species is common across much of its California and Oregon range, though Canadian populations on Vancouver Island are federally listed as Endangered due to urban development and intensive timber harvesting of ancient coastal Douglas fir habitats.
Interesting Factoid
The sharp, needle-like spike at the tip of the Sharp-tailed Snake’s tail is not a stinger and has no venom; the snake uses it as a biological anchor, digging the spike into wood to brace itself while wrestling slippery forest slugs.