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Species Profile

Night Snake

Hypsiglena

Small snake, big night shift
Matt Jeppson/Shutterstock.com

Night Snake Distribution

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Endemic Species
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Found in 2 countries

🇲🇽 Mexico 🇺🇸 United States
A night snake lying on a deck

At a Glance

Genus Overview This page covers the Night Snake genus as a group. Stats below are general traits shared across the genus.
Also Known As Nightsnake, Night-snake, Culebra nocturna
Diet Carnivore
Activity Nocturnal+
Lifespan 6 years
Weight 0.15 lbs
Status Not Evaluated
Did You Know?

Size across Hypsiglena: typically ~20-70 cm total length, depending on species and population.

Scientific Classification

Genus Overview "Night Snake" is not a single species but represents an entire genus containing multiple species.

Night snakes (Hypsiglena) are small, primarily nocturnal colubrid snakes of western North America, typically secretive and often found under surface cover (rocks, boards) or active on warm nights. They are rear-fanged and mildly venomous to small prey but are not considered dangerous to humans.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Colubridae
Genus
Hypsiglena

Distinguishing Features

  • Small, slender build with a head only slightly distinct from the neck
  • Nocturnal/crepuscular activity; commonly hides under cover during the day
  • Typically patterned with darker blotches or bands; some species show a collar-like marking behind the head
  • Rear-fanged (opisthoglyphous) dentition typical of many colubrids

Physical Measurements

Males and females differ in size

Length
♂ 1 ft 6 in (8 in – 2 ft 11 in)
♀ 1 ft 6 in (8 in – 2 ft 7 in)
Weight
♂ 0 lbs (0 lbs – 0 lbs)
♀ 0 lbs (0 lbs – 0 lbs)
Tail Length
♂ 4 in (2 in – 8 in)
♀ 4 in (1 in – 7 in)
Top Speed
1 mph
slithering
Venomous

Appearance

Primary Colors
Brown Tan Gray
Secondary Colors
Cream Black Spotted Striped
Skin Type Smooth, glossy scales typical of small dipsadid snakes; scales often appear satin-like under light.
Distinctive Features
  • Small, slender dipsadid snakes; adult total length commonly ~20-60 cm across the genus (smallest to largest species/populations).
  • Head only slightly wider than neck; large eyes with vertical pupils emphasize nocturnal activity.
  • Dark post-ocular stripe and a nuchal (neck) collar are common, but can be reduced or fragmented in some taxa.
  • Primarily nocturnal and secretive; often found under rocks, boards, bark, or other surface cover by day.
  • Active on warm nights on the ground; habitat use spans deserts, chaparral, grassland edges, and rocky woodland depending on species/region.
  • Rear-fanged (opisthoglyphous) with mild venom adapted to small prey; not considered dangerous to humans.
  • Diet broadly includes small lizards (especially), amphibians, small snakes, and occasionally small mammals/invertebrates; proportions vary by locality and species.
  • Lifespan is variable and poorly documented across all species; typically several years, with upper ranges often reported around ~5-10+ years in captivity/field estimates depending on conditions.
  • Considerable geographic variation in color and pattern; species limits and names have been revised in some sources, so appearance can overlap among described taxa.

Sexual Dimorphism

Dimorphism is generally subtle across Hypsiglena. Females often attain slightly greater total length and mass, while males may have proportionally longer tails and slightly more robust tail bases; overlap is extensive and varies by species.

♂
  • Often proportionally longer tail relative to body length.
  • Slightly thicker tail base (hemipenial region), though subtle without measurement.
♀
  • Often slightly larger-bodied at maturity in some species/populations.
  • May show slightly shorter relative tail length on average.

Did You Know?

Size across Hypsiglena: typically ~20-70 cm total length, depending on species and population.

They're rear-fanged colubrids; the mild venom helps subdue small prey (and they're not considered dangerous to people).

Most species are nocturnal or crepuscular, often found under rocks/boards by day and moving on warm nights.

Diet across the genus commonly centers on small lizards (e.g., geckos/skinks), with frogs/salamanders, small mammals, and even small snakes taken in some areas.

Egg-layers: clutches are usually small (often ~2-9 eggs), but timing and clutch size vary by species and climate.

They occur in a wide mix of western habitats-deserts, shrublands/chaparral, woodlands, and rocky canyons-often from lowlands up into montane zones.

Species limits and names have been revised in multiple sources; what older guides called one widespread species is now often split into several regional species.

Unique Adaptations

  • Rear-fanged venom delivery (Duvernoy's gland secretions): well-suited for subduing small, squirmy prey like lizards and amphibians.
  • Vertical, "cat-like" pupils: an eye design commonly associated with low-light hunting, matching the genus's nocturnal tendencies.
  • Cryptic blotched patterning: browns/greys and neck markings help them disappear against rock, leaf litter, and desert soils; patterns vary widely among species and regions.
  • Slender build and flexible skull: helps them probe crevices and tight refuges where geckos and small reptiles hide.
  • Water-stress tolerance (in many desert-dwelling populations): behaviorally managed through nocturnal activity and use of humid microrefugia under cover.

Interesting Behaviors

  • Night-surface activity: many Hypsiglena emerge after sunset, especially on warm, calm nights, cruising slowly along rock edges, washes, and road cuts.
  • Cover-seeking by day: they commonly shelter under surface cover (rocks, boards, bark, debris) or in cracks/rodent burrows; how strongly they rely on cover varies with habitat aridity and heat.
  • Prey tracking and careful strikes: often take lizards at night or from retreats; rear fangs and controlled chewing help deliver venom to small prey.
  • Seasonal rhythms: activity peaks can track local temperatures and rains-some populations are most detectable in spring and fall, others during warm monsoon-like periods.
  • Defense is usually low-key: many individuals try to freeze or slip away; if handled they may bluff-strike, flatten the head slightly, or release musk-intensity varies among species and individuals.
  • Localized home ranges: they tend to be secretive and sparsely encountered; detectability can jump after storms or during warm-night movements.

Cultural Significance

Hypsiglena are small and secretive, so they show up less in folklore but matter in western deserts and woodlands' hidden nightlife. Naturalists and herpetologists call them a find-under-a-rock sign of overlooked biodiversity, and educators use their mild venom and rear fangs to show venom varies and isn't always dangerous.

Myths & Legends

Name-story (scientific): the genus name Hypsiglena comes from Greek roots referring to "high" and "eye," a nod to the prominent eyes/vertical pupils that give night snakes a cat-eyed look.

Name-story (common): "night snake" reflects the long-noted habit of being most active after dark-an observation repeated in early western North American field notes and collecting accounts.

In the U.S. Southwest and northern Mexico, night snakes and other snakes active at night are in local stories and old beliefs as creatures of darkness; small harmless species like Hypsiglena are often lumped in.

Naturalist anecdote: early collectors and many modern field biologists remark that night snakes are found where people least expect-under a single flat rock or board-feeding the enduring "treasure under cover" tradition in desert natural history.

Conservation Status

NE Not Evaluated (genus-level). Hypsiglena is not assessed as a single unit; species-level assessments are mostly Least Concern where evaluated, with several taxa recently split or data-poor and treated as NE/DD in practice.

Has not yet been evaluated against the criteria.

Population Unknown

Protected Under

  • Area-based protections in portions of the range (e.g., U.S./Mexico protected areas, state parks, national parks)
  • General native wildlife protections that vary by U.S. state and Mexican jurisdiction (not typically species-specific for Hypsiglena)
  • Not CITES-listed as a genus

Looking for a specific species?

Western night snake

Hypsiglena torquata

In much of the western United States, the unqualified common name "night snake" most often refers to the Western night snake, historically treated broadly and still commonly used in field guides and outreach.

  • Adults are small and slender; most Hypsiglena night snakes are about 30-50 cm in total length, with maximum reported lengths around 67 cm.
  • Primarily nocturnal and secretive; commonly found under surface cover (rocks, boards, bark) by day and active on warm nights-though activity timing varies with local temperature and season.
  • Rear-fanged with mild venom adapted for small prey (especially lizards and their eggs); bites to humans are uncommon and generally not considered medically significant.
  • Diet across the genus is usually lizard-heavy, but local populations/species may also take small snakes, amphibians, and occasionally very small mammals, reflecting regional prey availability.
  • Lifespan varies by species and conditions; a broad, genus-level estimate is roughly ~5-12+ years, with longer longevity more likely in captivity than in the wild.

You might be looking for:

Desert Night Snake

34%

Hypsiglena chlorophaea

Widespread in the southwestern United States and parts of northern Mexico; one of the best-known members of the genus.

Texas Night Snake

22%

Hypsiglena jani

Occurs in Texas and adjacent regions; often referenced in regional field guides.

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Banded Night Snake (historical broad concept)

18%

Hypsiglena torquata

Name widely used historically when multiple lineages were lumped; still encountered in older sources and some checklists.

Sonoran Night Snake

12%

Hypsiglena catalinae

Associated with the Sonoran region (including parts of Arizona and northwestern Mexico); taxonomy varies by authority.

Life Cycle

Birth 4 hatchlings
Lifespan 6 years

Lifespan

In the Wild
2–12 years
In Captivity
5–18 years

Reproduction

Mating System Polygynandry
Social Structure Solitary
Breeding Pattern Seasonal
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Across Hypsiglena, adults are generally solitary and come together briefly during the breeding season. Males likely mate opportunistically with multiple females, and females may mate with multiple males across a season; no pair bonds or parental care occur beyond egg-laying.

Behavior & Ecology

Social Aggregation Group: 1
Activity Nocturnal, Crepuscular
Diet Carnivore Small lizards and their eggs (a common, genus-wide staple, with emphasis varying by local prey availability)
Seasonal Hibernates 1 mi

Temperament

Secretive and cryptic; avoids exposure by using cover and retreat sites
Generally non-aggressive toward humans; prefers escape over confrontation
Defensive when handled: may flatten head, strike, or bite
May release musk/feces when threatened; defensive intensity varies among species and individuals
Tolerant of conspecific proximity in limited refuges, but not socially affiliative

Communication

hissing Occasional, defensive
chemical signaling via pheromones for mate finding and reproductive readiness
tongue-flick chemoreception for tracking prey and conspecific scent trails
tactile contact during courtship (body alignment, rubbing) to coordinate mating
substrate-borne vibrations/body posturing used in threat display or deterrence
spatial signaling through refuge use; repeated site use may create localized scent presence

Habitat

Desert Shrubland Grassland Woodland Deciduous Forest Coniferous Forest Mountain Cliff/Rocky Outcrop River/Stream Coastal Urban Suburban Agricultural/Farmland +7
Biomes:
Desert Hot Desert Cold Mediterranean Temperate Grassland Temperate Forest Tropical Dry Forest Savanna +1
Terrain:
Mountainous Hilly Plateau Plains Valley Coastal Island Riverine Rocky Sandy Karst +5
Elevation: Up to 9842 ft 6 in

Ecological Role

Small nocturnal mesopredator in western North American terrestrial ecosystems (desert scrub, chaparral, grassland edges, rocky canyons, and open woodland), with diet and prey emphasis varying among species and regions.

Regulates small vertebrate populations (especially lizards) and can locally reduce recruitment via egg predation Links nocturnal prey communities to higher trophic levels as both predator and prey (important food for owls, larger snakes, and mammalian carnivores) Contributes to energy flow and community structure in arid and semi-arid habitats by exploiting prey hidden under cover objects May help limit local outbreaks of certain large arthropods in populations where invertebrate predation is more common

Diet Details

Main Prey:
Small lizards Reptile eggs Small snakes Small amphibians Small mammals Large arthropods

Human Interaction

Domestication Status

Wild

Hypsiglena (night snakes) are not domesticated. Across the genus, human interaction has historically been incidental (field encounters, relocation from homes/yards, road mortality) plus limited scientific collection. A small number enter the hobby via opportunistic collection or occasional captive breeding, but there is no long-term selective breeding history comparable to truly domesticated reptiles.

Danger Level

Low
  • Rear-fanged, mildly venomous to small prey; bites to humans are uncommon and typically cause little to mild local effects (pinprick pain, minor swelling/itching), though sensitivity varies.
  • Defensive biting can occur if handled; risk increases with prolonged handling or attempting to force-feeding/medication.
  • As with most reptiles, potential for Salmonella exposure from handling (mitigated by hygiene).
  • Misidentification risk: may be mistaken for more dangerous snakes, leading to unnecessary killing or risky handling attempts by people.

As a Pet

Not Suitable as Pet

Legality: Laws change by place. In much of western U.S. and northern Mexico, keeping native colubrids like Hypsiglena may be allowed but often needs permits, limits, area bans, and transport rules. Wild-caught pets are the main legal/ethical concern; check local laws.

Care Level: Experienced

Purchase Cost: Up to $150
Lifetime Cost: $400 - $2,500

Economic Value

Uses:
Ecosystem services (predation on small vertebrates and occasionally pest species) Education/outreach (nature centers, herpetology programs) Scientific research/monitoring (biodiversity surveys, venom evolution, nocturnal ecology) Limited pet trade (uncommon, mostly local/occasional)
Products:
  • No major commercial products. Non-consumptive value includes ecotourism/educational displays and research data (e.g., distribution records, ecological studies).

Relationships

Predators 8

Great horned owl Bubo virginianus
Burrowing owl
Burrowing owl Athene cunicularia
Red-tailed Hawk Buteo jamaicensis
Greater roadrunner
Greater roadrunner Geococcyx californianus
Common kingsnake Lampropeltis getula
Coachwhip
Coachwhip Masticophis flagellum
Coyote
Coyote Canis latrans
Striped skunk Mephitis mephitis

Related Species 5

Cat-eyed snakes
Cat-eyed snakes Leptodeira Shared Family
Lyre snakes Trimorphodon Shared Family
Cat snakes
Cat snakes Boiga Shared Genus
Black-headed snake Tantilla Shared Genus
Ground snakes Sonora Shared Genus

Ecological Equivalents 5

Animals that fill a similar ecological role in their ecosystem

Cat-eyed snake
Cat-eyed snake Leptodeira Similar niche to small-to-medium, mostly nocturnal colubrids that hunt vertebrate prey at night. Often associated with rocky or brushy habitats and prey on lizards and amphibians.
Lyre snakes Trimorphodon Nocturnal and crepuscular western North American snakes that shelter under rocks or other cover by day and hunt lizards and small vertebrates at night. They broadly overlap in habitat and activity timing.
Cat snakes
Cat snakes Boiga Old World analogue: predominantly nocturnal, rear-fanged colubrids that hunt sleeping lizards and birds; ecologically similar despite not being closely related geographically.
Black-headed snakes Tantilla Small, secretive, often nocturnal or crepuscular snakes that spend much time under cover and specialize on small prey; exhibit a similar cryptic, cover-associated lifestyle, though their diet is often more invertebrate-focused.
Leaf-nosed snakes Phyllorhynchus Small desert snakes that are nocturnal and have a strong tendency to remain hidden under surface cover; they occupy arid-land habitats and use similar predator-avoidance strategies.

Types of Night Snake

4

Explore 4 recognized types of night snake

Western night snake Hypsiglena torquata
Desert night snake Hypsiglena chlorophaea
Jan's night snake Hypsiglena jani
California (coast) night snake Hypsiglena ochrorhyncha

Night snakes are sometimes mistaken for rattlesnakes due to some shared characteristics.

The range of the night snake stretches from the southern part of Canada, through the western part of the United States from Idaho to Texas, then down into Mexico. Their habitat includes deserts, meadows, forests, and rocky areas.

It’s considered fairly small in size at up to 26 inches long. They hide beneath rocks, brush, and other debris during the daytime hours. This reptile has a small amount of venom in its saliva.

4 Night Snake Amazing Facts

Texas Night Snake has vertical pupils that allow it to see in the dark when it’s hunting.

Texas Night Snake has vertical pupils that allow it to see in the dark when it’s hunting.

©Matt Jeppson/Shutterstock.com

  • It is commonly mistaken for a young rattlesnake due to its triangular-shaped head and elliptical pupils
  • Baby snakes of this species hatch in late summer
  • It goes into brumation in the winter sometimes sharing a den with rattlesnakes
  • Its fangs are in the back instead of the front of its mouth

Evolution and Origins

On September 28, 1980, the Night Snake was discovered in Canada in the Okanagan Valley of south-central British Columbia. Only 16 more people have been observed, photographed, or collected since then.

Since May 1995, only five people have reported there have been no studies specifically on Night Snakes in British Columbia, summed up data available on British Columbia specimens. This data includes information from a magazine article and an unpublished report on the status of the Night Snake in British Columbia.

Furthermore, a general understanding of snakes indicates that snakes evolved on land, as opposed to in water, during the middle of the Early Cretaceous period (about 128.5 million years ago), and that they most likely began in the former supercontinent of Laurasia. During this time, numerous species of birds and mammals appeared on Earth quickly.

With that said, there isn’t much information about these snakes.

Where to Find a Night Snake

A night snake lying on a rock

Night snakes have two large brown splotches behind their heads

©Matt Jeppson/Shutterstock.com

The night snake lives in Canada, specifically in the southern portion of British Columbia. They live in the western and southern parts of the United States from Washington through Idaho, California, and Utah continuing southward into Texas. They also make their home in the northern part of Mexico.

This snake is seen in lots of different habitats. They can live in a desert, meadow, rocky area, or forest environment. These snakes can survive in a tropical or temperate climate.

This snake is active at night. That’s how it got its name! At dusk, they come out from beneath piles of brush or rocks to start hunting for prey. Baby night snakes start looking for insects so they can learn how to hunt.

Countries where the night snake lives:

Types of Night Snake

Night Snake

Night snakes, found in Oregon’s deserts, are nonvenomous but look a lot like rattlesnakes

©ALAN SCHMIERER / flickr – Original / License

Night snakes are members of the very large Colubridae family. Within that family, the Hypsiglena genus includes at least 17 types of night snakes. Some examples are:

  • Texas night snake (Hypsiglena torquata jani)-The Texas night snake is rear-fanged like the Hypsiglena torquata and has similar coloration. But the Texas night snake is smaller in size at about 16 inches in length.
  • California night snake (Hypsiglena torquata nuchalata)-This type of night snake has mild venom, a flat head, and lives in a desert or rocky habitat. One difference between this snake and the Hypsiglena torquata is its range doesn’t extend past California.
  • San Diego night snake (Hypsiglena ochrorhyncha klauberi)-The San Diego night snake is another example of many night snakes living in California. It has the same elliptical pupils as a Hypsiglena torquata as well as a flat head and nocturnal behavior. However, this snake is definitely smaller in size at just 8 to 16 inches in length.

Additionally, here is our full list:

  • North American Night Snake (Hypsiglena torquata)
  • Arizona Night Snake (Hypsiglena chlorophaea)
  • Texas Night Snake (Hypsiglena jani)
  • California Night Snake (Hypsiglena ochrorhyncha)
  • San Diego Night Snake (Hypsiglena ochrorhyncha klauberi)
  • Sierra Madre Night Snake (Hypsiglena ochrorhyncha luteola)
  • Mexican Night Snake (Hypsiglena ochrorhyncha mexicana)
  • Great Basin Night Snake (Hypsiglena chlorophaea deserticola)
  • Colorado Desert Night Snake (Hypsiglena chlorophaea loreala)
  • Sonoran Night Snake (Hypsiglena ochrorhyncha collaris)
  • Utah Night Snake (Hypsiglena chlorophaea klauberi)
  • Baja California Night Snake (Hypsiglena ochrorhyncha slevini)
  • Santa Cruz Night Snake (Hypsiglena ochrorhyncha lunalata)
  • Yuman Night Snake (Hypsiglena ochrorhyncha schmidti)
  • Idaho Night Snake (Hypsiglena torquata deserticola)
  • Oregon Night Snake (Hypsiglena torquata klauberi)
  • Nevada Night Snake (Hypsiglena torquata similes)

It’s worth noting that the classification and identification of some of these species can be somewhat contentious, and different sources may list slightly different species names or group them differently.

Scientific Name

A non-venomous Night Snake

Night snakes aren’t venomous but they can release a mild toxin if they handled

©Rusty Dodson/Shutterstock.com

Hypsiglena torquata is the night snake’s scientific name. The Latin word torquata means neck chain or collar. This refers to the two large, dark brown blotches at the base of this snake’s head. These blotches give the impression of a collar on this snake.

Its family is called Colubridae, and it is in the Reptilia class.

Population and Conservation Status

The IUCN Red List of Threatened Species reports there are 100,000 plus night snakes in existence. The status of their population is described as stable, especially in Mexico and they are identified as Least Concern.

Appearance and Description

A hand holding a night snake

Night snakes have elliptical eyes

©Viktor Loki/Shutterstock.com

The night snake is 12 to 26 inches long with a thick body. This snake has a narrow snout that gradually widens until it reaches the base of its head. This gives it’s head a triangular shape. Its eyes have elliptical pupils.

This snake has dull gray or light brown scales with a pattern of dark brown splotches on its back. It has two large dark brown splotches located at the base of its head and a dark stripe that connects to the edge of each eye. The belly of this snake is white.

How to identify a night snake:

  • Gray or light brown with dark brown splotches on its back
  • Two dark brown splotches at the base of its head
  • A triangular-shaped head
  • White belly
  • Elliptical pupils

Night Snake vs. Rattlesnake

Night snakes are sometimes mistaken for young rattlesnakes. This can be a problem. One snake is extremely poisonous and dangerous to humans while the other is not. Recognizing the similarities and differences between these two snakes can be helpful.

One similarity between these two snakes is they both have a dark stripe touching each eye. Also, both snakes have elliptical pupils. Furthermore, a night snake has the ability to flatten its head making it look even more triangular. When it feels threatened and takes this pose, it looks a lot like a rattler! Fortunately, there are some differences to look for when identifying these snakes.

One big difference is a rattlesnake has a row of rattles on its tail whereas a night snake’s tail doesn’t have any rattles. Also, rattlesnakes are normally much longer than night snakes.

Keep in mind that rattlesnakes have potent venom while night snakes have mild venom that doesn’t pose a threat to humans.

Rock Rattlesnake

While night snakes can be mistaken for rattlesnakes due to their head shape and elliptical eyes, only rattlesnakes sport a rattle on their tails.

©Matt Jeppson/Shutterstock.com

How Dangerous Are They?

Night snakes are poisonous. But the venom that drips out of their rear fangs is only a threat to its prey of lizards, frogs, and small snakes. In short, a person who receives a bite from a night snake is not likely to be harmed by its venom. But it’s still a snake bite and needs attention and care.

Washing the bite wound with soap and warm water is the first step. Next, apply first-aid cream to the injury and adhere a bandage over it. Be on the lookout for extreme redness or swelling that can indicate the growth of infection. If either of these symptoms develops, go to a medical professional for further care.

Behavior and Humans

Night snakes are timid reptiles. Their mild temperament combined with their small size has made them an appealing pet for some reptile enthusiasts. Remember that pet snakes need unique care. They need a temperature-controlled habitat, the proper level of humidity, and the right type of diet to remain healthy. It takes a dedicated owner to care for this snake.

Night snakes are a common sight for drivers traveling on desert roads at night. These snakes are out looking for food.

View all 98 animals that start with N

Sources

  1. Desert Museum / Accessed April 29, 2022
  2. IUCN Red List / Accessed April 29, 2022
  3. California Herps / Accessed April 29, 2022
  4. EOL / Accessed April 29, 2022
  5. Wikipedia / Accessed April 29, 2022
  6. CDC / Accessed April 29, 2022
  7. Nature Mapping Foundation / Accessed April 29, 2022
Rebecca Bales

About the Author

Rebecca Bales

Rebecca is an experienced Professional Freelancer with nearly a decade of expertise in writing SEO Content, Digital Illustrations, and Graphic Design. When not engrossed in her creative endeavors, Rebecca dedicates her time to cycling and filming her nature adventures. When not focused on her passion for creating and crafting optimized materials, she harbors a deep fascination and love for cats, jumping spiders, and pet rats.
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