Overview
The Night Snake (Hypsiglena torquata) is a small, enchanting nocturnal reptile celebrated for its vertical, cat-like pupils and glossy, spotted desert camouflage. Roaming the rocky canyons and sagebrush steppes of western North America, this gentle rear-fanged colubrid is a dedicated hunter of sleeping desert lizards, utilizing mild, specialized saliva to subdue struggling geckos and skinks.
Biology and Physical Characteristics
Hypsiglena torquata features a slender, smooth-scaled body colored sandy-buff, pale grey, or yellowish-tan, densely marked with 50 to 70 dark brown or grey blotches along the spine. Its defining hallmark is a pair of large, dark brown collar blotches on the neck that often fuse into a bold dark nape band. Its eyes are golden-copper with narrow, vertical slit pupils adapted for sharp nocturnal vision.
Behavior and Ecology
Strictly nocturnal and crepuscular, the Night Snake spends scorching desert days concealed beneath flat rocks, in crevices, or inside abandoned rodent burrows. At twilight, it emerges to patrol rocky washes, using acute scent trailing to track sleeping side-blotched lizards and western banded geckos in their nocturnal roosts, seizing them and chewing mild venom into the prey with enlarged, grooved rear teeth.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the Night Snake is widespread and abundant throughout western deserts and canyon country. Completely harmless to humans and pets—its mild rear-fanged venom only affects small lizards and frogs—it is frequently encountered crossing warm desert asphalt roads on summer nights.
Interesting Factoid
The Night Snake possesses vertical slit pupils just like a cat, which expand into enormous perfect circles in pitch-black darkness to help it hunt sleeping lizards on starlit desert rocks.