of Mexico. Habitat The preferred habitat of night snakes is semiarid desert regions with rocky and sandy soils. Description Night snakes typically do not exceed a total length (including tail) of . They are slender-bodied with a flattened head, and have small eyes with vertical pupils. Their color varies depending on their locality, often matching the soil color of their native habitat. They occur in various shades of gray, and brown, with dark brown, gray or black blotches on the back and the sides. Many also have distinctive black markings on the neck region. BehaviorHypsiglena are nocturnal and terrestrial. Diet The diet of night snakes consists primarily of lizards, but they will also consume smaller snakes, and amphibians. Venom The venom of Hypsiglena is not considered to be dangerous to humans. References Further reading Cope ED (1860). "Catalogue of the Colubridæ in the Museum of the Academy of Natural Sciences of Philadelphia, with notes and descriptions of new species. Part 2". Proc. Acad. Nat. Sci. Philadelphia 12: 241–266. (Hypsiglena'', new genus, p. 246). External links Colubrids Vertebrates of Mexico Reptiles of the United States Snake genera Taxa named by Edward Drinker Cope