
Night Snake
Hypsiglena chlorophaea
A small, secretive, cat-eyed colubrid of arid western North America.
- Adult length
- 30-46 cm (12-18 in)
- Range
- Western United States and northern Mexico
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Overview
The Night Snake is a small, slender colubrid found throughout much of the western United States and adjacent Mexico. Despite its snake-like resemblance to a young rattlesnake, it is unrelated and lacks a rattle.
How to identify it
- Pale gray, tan, or light brown ground color with dark brown or gray blotches down the back
- Vertically elliptical (cat-like) pupils, unusual among North American colubrids
- Smooth scales and a slightly flattened head
- A pair of dark blotches on the neck often resembling a collar
- Small size, rarely exceeding 46 cm (18 in)
It can be distinguished from young rattlesnakes by its lack of a rattle and narrower head, requiring attention to overall body shape and blotch pattern.
Habitat & range
Night Snakes occupy a wide range of arid and semi-arid habitats, including rocky hillsides, desert scrub, grasslands, and open woodland, from near sea level up to about 2,700 m (9,000 ft) in some areas. They are found from the western United States south into Mexico, sheltering by day under rocks, logs, and surface debris.
Behavior, diet & reproduction
This species is nocturnal, becoming active after dusk to hunt. It feeds primarily on lizards and their eggs, as well as small amphibians and occasionally invertebrates. They are egg-laying, with females depositing small clutches of a few eggs in summer.
Frequently asked questions
How big does the Night Snake get?
Adults typically reach 30-46 cm (12-18 in) in length.
Where is the Night Snake found?
It occurs across the western United States and into northern Mexico in arid and semi-arid habitats.
What does a Night Snake eat?
It preys mainly on lizards and their eggs, along with small amphibians and invertebrates.
Night Snake guides
In-depth guides for identifying and understanding Night Snake.