G
Species Profile

Grass Snake

Natrix natrix

The wetland snake that plays dead
iStock.com/Wildnerdpix

Grass Snake Distribution

Click a location to explore more animals from that region

Loading map...
A common garter snake slithering in grass

At a Glance

Wild Species
Also Known As Ringed snake, Ring snake, Ringsnake, Collared snake, Water snake
Diet Carnivore
Activity Diurnal+
Lifespan 10 years
Weight 1 lbs
Status Least Concern
Did You Know?

Typical adult total length is ~70-120 cm; large females can reach ~150 cm (reported maxima vary by region and taxonomy in the Natrix natrix complex).

Scientific Classification

The Grass Snake (Natrix natrix) is a non-venomous European colubrid strongly associated with wetlands and grassy margins. It commonly preys on amphibians and is known for defensive displays such as feigning death and releasing foul-smelling secretions.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Colubridae
Genus
Natrix
Species
Natrix natrix

Distinguishing Features

  • Typically olive/grey-brown body with darker blotches
  • Characteristic pale (often yellow/cream) collar behind the head in many individuals
  • Strong association with water; excellent swimmer
  • Non-venomous; may flatten head, hiss, or play dead when threatened

Physical Measurements

Males and females differ in size

Length
2 ft 7 in (1 ft 12 in – 3 ft 7 in)
3 ft 3 in (1 ft 12 in – 4 ft 11 in)
Weight
0 lbs (0 lbs – 1 lbs)
1 lbs (0 lbs – 1 lbs)
Tail Length
7 in (5 in – 10 in)
9 in (6 in – 1 ft 2 in)
Top Speed
3 mph
Estimated short-burst 3.6–7.2 km/h

Appearance

Primary Colors
Secondary Colors
Skin Type Dry, keratinized reptile skin with strongly keeled dorsal scales (gives a matte, roughened look); ventral scutes enlarged for locomotion; scales shed periodically as a single slough.
Distinctive Features
  • Non-venomous colubrid (no vipers' heavy body/triangular head); head usually only slightly broader than neck.
  • Key ID feature: pale nuchal 'collar' often present (yellow/cream/white) bordered by black; however collar may be reduced or absent (Speybroeck et al., 2016).
  • Dorsal scales distinctly keeled, unlike many smooth-scaled colubrids.
  • Ventral surface commonly shows a high-contrast black-and-white checkerboard/barring (Arnold & Ovenden, 2002).
  • Adult size: commonly ~60-100 cm total length; females average larger than males; maximum reported up to ~200 cm in exceptional individuals (Arnold & Ovenden, 2002; Speybroeck et al., 2016).
  • Wetland-associated appearance/conditioning: frequently encountered near ponds, marshes, slow rivers, wet meadows; excellent swimmer.
  • Diet-linked morphology/behavior: commonly preys heavily on amphibians (frogs/toads/newts) and often forages along water margins.
  • Defensive display: thanatosis (feigning death) and release of foul-smelling cloacal secretions/musk when handled or threatened (widely documented for Natrix natrix in field guides and behavioral reports; e.g., Arnold & Ovenden, 2002).
  • Pupils round; body relatively slender; tail moderate length (longer relative tail in males).

Sexual Dimorphism

Grass Snake (Natrix natrix) males and females differ mainly in size and shape. Females are usually longer and heavier; males have longer tails compared to their body and look slimmer. Adults: males about 60–90 cm, females about 80–120 cm (varies by population; some larger).

  • Typically smaller overall body length and mass than females; more slender-bodied on average.
  • Relatively longer tail (greater subcaudal count) and a more pronounced tail base due to hemipenes.
  • Typically larger overall (longer and heavier-bodied) and more robust, especially when gravid.
  • Relatively shorter tail compared with males (proportionally).

Did You Know?

Typical adult total length is ~70-120 cm; large females can reach ~150 cm (reported maxima vary by region and taxonomy in the Natrix natrix complex).

Hatchlings are usually ~14-20 cm total length at emergence (field-guide ranges reported across Europe).

Oviparous: females commonly lay ~10-40 eggs per clutch, with larger clutches reported in exceptional cases; eggs are often placed in warm rotting vegetation (e.g., compost/manure heaps).

Diet is strongly amphibian-focused (frogs, toads, newts) and may include fish-one reason it's so tightly tied to wetlands and ponds.

When threatened it may perform thanatosis (feigning death): flipping belly-up, gaping, going limp-often combined with a foul-smelling cloacal secretion.

The pale neck collar (often yellow/cream with dark half-moons) is a classic ID mark-but it can be reduced or absent in some individuals, including melanistic snakes.

It is a capable swimmer and frequently forages along reedbeds, ditches, lake margins, and slow rivers, using both land and water escape routes.

Unique Adaptations

  • Thanatosis + chemical defense combo: a highly effective predator-deterrent in a non-venomous snake (limp body, inverted posture, gaping, and strong-smelling cloacal discharge).
  • Semi-aquatic build: strongly keeled dorsal scales and a relatively streamlined body aid traction and propulsion in water and wet vegetation typical of Natrix.
  • Thermal strategy for egg development: exploiting heat from decomposing vegetation (compost/manure heaps) creates stable, warm incubation conditions without parental care.
  • Collar-and-checker patterning: disruptive markings (variable among individuals) that can break up the outline in dappled wetland vegetation; collar may also draw attacks toward less vital areas.
  • Flexible, kinetic skull and recurved teeth: allows swallowing bulky, slippery prey such as frogs and fish without constriction.

Interesting Behaviors

  • Wetland-edge foraging: actively searches grassy margins and shallow water for amphibians, often hunting by day in warm weather.
  • Dramatic defensive sequence: hissing, head-flattening and bluff strikes, then thanatosis (going limp, rolling over, mouth partly open) plus release of musk/feces from cloacal glands.
  • Seasonal basking: regularly basks near cover (tussocks, logs, reed edges) to raise body temperature for digestion and activity.
  • Spring courtship gatherings: multiple males may follow and court a female, sometimes forming writhing "mating balls" typical of several natricine snakes.
  • Communal egg-laying: multiple females may use the same warm incubation sites (compost/manure/rotting plant piles) when suitable sites are limited.
  • Hibernation/overwintering: shelters in frost-protected refuges (burrows, root systems, stone piles), sometimes communally in traditional hibernacula.

Cultural Significance

In parts of Northern and Eastern Europe, the grass snake (Natrix natrix) is seen as a protective "house snake" linked to homes, farms, ponds and good luck. Today it also stands for wetland health and is protected.

Myths & Legends

Lithuanian and Latvian "house snake" tradition: a grass snake kept near the hearth or farmstead was treated as a benevolent household spirit; harming it was believed to bring misfortune.

Lithuanian legend often translated as "Egle, Queen of Serpents": a woman marries a serpent or sea-king in one of the best-known Baltic serpent tales, sometimes linked in popular tradition with the familiar grass snake.

Baltic prosperity beliefs: offerings (including bowls of milk in some regional tellings) were sometimes left for a household snake to secure luck, fertility, or protection for livestock and family.

Slavic folk belief in protective household serpents: in some rural traditions, a snake living under the threshold or near the stove was seen as a guardian of the home; driving it away could invite hardship.

Folk tales about the Grass Snake (Natrix natrix) in rural Europe say harmless snakes visit farms and barns to drink or 'steal' milk from cows, part of farm stories about not poisonous snakes.

Conservation Status

LC Least Concern

Widespread and abundant in the wild.

Population Stable

Protected Under

  • Bern Convention on the Conservation of European Wildlife and Natural Habitats: Appendix III (protected fauna; exploitation regulated).
  • Protected under various national laws across its European range (example: Great Britain-Wildlife and Countryside Act 1981 affords protection from intentional killing/injury/taking of wild reptiles).

Life Cycle

Birth 20 hatchlings
Lifespan 10 years

Lifespan

In the Wild
5–15 years
In Captivity
15–25 years

Reproduction

Mating System Promiscuity
Social Structure Aggregation Group
Breeding Pattern Transient
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Grass snake (Natrix natrix) breed in spring soon after leaving hibernation. There is no pair bond: males find females by scent, form short groups with many males, and females may lay eggs alone or in shared sites. No parental care; eggs may have fathers from more than one male.

Behavior & Ecology

Social Congregation Group: 1
Activity Diurnal, Crepuscular, Cathemeral
Diet Carnivore Amphibians-especially frogs and toads (numerous field-diet studies report amphibians as the dominant prey category for Natrix natrix, with fish taken opportunistically).
Seasonal Migratory, Hibernates 2 mi

Temperament

Generally shy and non-aggressive toward humans; tends to flee rather than confront
Strongly defensive when restrained or cornered: rapid escape attempts, hissing, neck/body flattening
Frequent use of thanatosis (death-feigning) and release of foul-smelling cloacal secretions as anti-predator defenses (widely reported for Natrix natrix; see Arnold & Ovenden, 2002; Speybroeck et al., 2016)
Seasonally increased tolerance of conspecific proximity at hibernacula and breeding sites (aggregation without social bonding)

Communication

hissing produced by forceful expiration as a defensive signal; snakes lack vocal cords and do not produce complex calls General reptile physiology; summarized in many herpetology texts, e.g., Greene, 1997
chemical communication via tongue-flicking and vomeronasal (Jacobson's) organ to track prey and conspecific scent trails
pheromonal cues during reproduction Sex recognition and mate tracking via skin/lipid pheromones; broadly documented in snakes, and inferred for Natrix natrix as in Speybroeck et al., 2016
tactile communication during courtship/mating Body contact, alignment, and pressing
visual/tactical defensive displays: body/neck flattening, sudden movements, and open-mouth threats; cloacal musk release as a chemical deterrent

Habitat

Biomes:
Freshwater Wetland Temperate Forest Temperate Grassland Mediterranean Boreal Forest (Taiga)
Terrain:
Riverine Valley Plains Hilly Coastal
Elevation: Up to 8202 ft 1 in

Ecological Role

Wetland-edge mesopredator specializing on amphibians; links aquatic and terrestrial food webs.

Regulates local amphibian (frog/toad/newt) populations, particularly around breeding ponds Contributes to energy transfer from aquatic prey to terrestrial predators (e.g., herons, raptors, mustelids) that consume N. natrix Indicator of healthy wetland/pond-edge prey communities due to reliance on abundant amphibian populations

Diet Details

Main Prey:
Frogs Toads Tadpoles and anurans Newts Salamanders Small fish Small reptiles and small mammals +1

Human Interaction

Domestication Status

Wild

Natrix natrix (grass snake) is wild, not domesticated, with no history of breeding for tameness. Humans kill or misidentify it, drain and fragment wetlands, cause road deaths, and rescue or monitor it. It lives in ponds, ditches and reedbeds. It may play dead, flatten its neck, hiss, or release a smelly fluid. Adults ~0.7–1.0 m; lay ~10–40 eggs in compost.

Danger Level

Low
  • Non-venomous; bites are typically superficial (minor puncture wounds) and usually occur only if handled.
  • Cloacal defensive secretions can cause strong odor and mild skin/eye irritation if contacted.
  • Standard reptile-associated hygiene risk: potential Salmonella carriage; handwashing after contact is recommended.
  • Indirect risk: misidentification can lead to unnecessary killing or risky handling of actual vipers in the same habitats.

As a Pet

Not Suitable as Pet

Legality: Whether you can keep Grass Snake (Natrix natrix) varies. Often protected in Europe—taking from the wild is illegal or needs permits (e.g., Bern Convention Appendix III). Captive-bred and U.S. state/Lacey Act rules differ—check local rules.

Care Level: Moderate

Purchase Cost: $50 - $200
Lifetime Cost: $1,700 - $3,500

Economic Value

Uses:
Ecosystem services (biodiversity/food-web role in wetlands) Education and outreach (wildlife awareness, museum/zoo interpretation) Research/monitoring (indicator of wetland condition; road ecology; population monitoring)
Products:
  • No conventional commercial products; value is primarily non-market (ecosystem and educational).
  • Occasional use in conservation programs, environmental education, and scientific studies (e.g., movement ecology, predator-prey dynamics with amphibians).

Relationships

Related Species 5

Barred Grass Snake Natrix helvetica Shared Genus
Dice Snake Natrix tessellata Shared Genus
Viperine Snake Natrix maura Shared Genus
Smooth Snake
Smooth Snake Coronella austriaca Shared Family
Aesculapian Snake
Aesculapian Snake Zamenis longissimus Shared Family

Ecological Equivalents 6

Animals that fill a similar ecological role in their ecosystem

Dice Snake Natrix tessellata Most similar European species: Natrix tessellata. Both live at freshwater edges, are strong swimmers, and share wetlands with the Grass Snake (Natrix natrix). N. tessellata eats fish while N. natrix eats amphibians; both flee into the water when threatened.
Viperine Snake Natrix maura Mediterranean/western-European wetland colubrid occupying pond and stream margins. Often preys on amphibians and fish and frequently forages in shallow water, a hunting mode similar to Natrix natrix (aquatic edge foraging, pursuit and strike at aquatic prey).
Common Garter Snake
Common Garter Snake Thamnophis sirtalis Non-venomous, low-toxicity natricine (colubrid-like) predator in North America that commonly hunts amphibians and small fish around wetlands. Functionally similar to Natrix natrix, occupying the same semi-aquatic amphibian-predator niche along grassy/wetland margins.
Northern Water Snake
Northern Water Snake Nerodia sipedon Semi-aquatic snake occupying comparable structural habitat (shorelines, emergent vegetation) and using similar escape behavior (diving into water). Overlaps in prey types (fish and amphibians). Serves as a close ecological analogue to N. natrix outside Europe.
Rough Green Snake
Rough Green Snake Opheodrys aestivus Included because it is often compared as a slender, non-venomous "grass" snake found in plant-covered areas, but it lives differently from Natrix natrix: it is primarily arboreal and insectivorous rather than wetland-associated or frog-eating. Both species hide in dense vegetation.
Smooth Green Snake
Smooth Green Snake Opheodrys vernalis Green/grass-snake look-alike that shelters in low vegetation and requires cover. Unlike Natrix natrix, it feeds primarily on invertebrates and is not a wetland-edge amphibian predator. Listed as a niche-contrast relative.

This common snake is of the nonvenomous variety and is also called the ringed snake and water snake.

The common grass snakes’ colors are gray or green with a white or yellow neck collar. They have identification marks of interlinked yellow and black on the neck, forming a ring or band. The face is a mask of slashes and black bars.

Fond of wet habitats, the common snake lurks in gardens and dry grasslands in locations near bodies of water. During warm months, the creature will lie in the sun near ponds and lakes, and sometimes enjoy a nice swim.

Other facts include:

  • The common snake preys on fish, amphibians, birds, and small mammals for its diet.
  • The reptiles hibernate between October and April.
  • When threatened, they release a smelly, sticky musk.
  • The predators have a lifespan of 10 years.

4 Amazing Common Snake Facts

Here are four facts about the reptile that is interesting, amazing, and informative.

  • Grass snakes are predators, feeding primarily on toads, frogs, and fish; with the occasional young birds and small mammals.
  • The reptiles seem to enjoy the day, often found lying in the sun.
  • Threatened snakes have a number of defensive strategies that include releasing horrible odors.
  • When it goes into a shedding cycle, it becomes defensive because it can’t see as well as normal.

Where to Find Them

The grass snake inhabits so much of western Asia and Europe (where three species of the reptile almost bombard the United Kingdom). So fruitful are the animals, they’re considered common, hence the name.

The creatures prefer locations near rivers, ponds, lakes, and other wetland habitats. They’re exceptional swimmers and spend time leisurely enjoying the waters and sun around their ecosystems.

Scientific Name

The common grass snake is classified Natrix natrix. Also known as a water snake or ringed snake, among many monikers, it’s a non-venomous Eurasian colubrid reptile.

Currently, scientists have five common grass snake subspecies listed:

  • Natrix natrix natrix
  • Natrix natrix moreotica
  • Natrix natrix scutata
  • Natrix natrix syriaca
  • Natrix natrix vulgaris

Population and Conservation Status

Grass snakes are common throughout most of its range, although there are pockets where the populations are fragmented.

Conservationists do not see any threat of endangerment for the common grass snake. According to the IUCN Red List, the species is listed as being of “Least Concern.” But though the population’s stable, the destruction of habitats and pollution pose a risk to the species’ amphibious diet.

Appearance and Description

The common grass snake is usually brown or dark green with a creamy-white to yellow collar behind its head. However, it can also range from gray to black, depending on its location. Its belly is usually off-white with black blotches that can be used to recognize individual snakes, much like a zebra’s stripes.

These snakes have round pupils and several large flat scales on its head and can grow to over three feet long.

How Dangerous Are They?

The grass snake is relatively harmless as it avoids conflict. In general, they pose no threat to other animals. But the creature’s bite can lead to severe illness and fatalities.

These snakes don’t tend to bite, but that doesn’t mean they won’t. Curious animals like dogs or cats have been on the wrong end of a grass snake’s teeth. If this happens, clean the wound to be sure it doesn’t become infected.

Behavior and Humans

Grass snakes are harmless, although they may musk when handled. These snakes are perfectly happy living anywhere they can find food.

In some cultures, they were revered as sacred animals. Baltic mythology holds that an injured snake may take its revenge or killing grass snakes could bring bad luck to the person who did the deed. In some Lativian and Lithuanian traditions, grass snakes are a sign of a house blessing.

View all 261 animals that start with G

Sources

  1. https://www.discoverwildlife.com/animal-facts/reptiles/facts-about-grass-snakes/
  2. https://www.everythingreptiles.com/types-of-garter-snakes/
  3. https://birdwatchinghq.com/garter-snakes-in-new-mexico/
  4. https://en.wikipedia.org/wiki/Grass_snake
  5. https://www.wildlifetrusts.org/wildlife-explorer/reptiles/grass-snake
  6. https://www.reptileadvisor.com/are-garter-snakes-good-pets/
  7. https://animals.net/grass-snake/#:~:text=Behavior%20of%20the%20Grass%20Snake,digested%2C%20they%20continue%20moving%20about.
  8. http://surrey-arg.org.uk/SARGWEB.php?app=SpeciesData&Species=grass_snake
  9. https://www.arc-trust.org/grass-snake#:~:text=Grass%20snakes%20are%20Britain's%20only,in%20the%20late%20summer%20months.
  10. https://www.softschools.com/facts/animals/grass_snake_facts/549/#:~:text=Grass%20snakes%20are%20carnivores%20(meat,hearing%20when%20it%20searches%20food.
  11. useum%20of%20Zoology.
Austin S.

About the Author

Austin S.

Growing up in rural New England on a small scale farm gave me a lifelong passion for animals. I love learning about new wild animal species, habitats, animal evolutions, dogs, cats, and more. I've always been surrounded by pets and believe the best dog and best cat products are important to keeping our animals happy and healthy. It's my mission to help you learn more about wild animals, and how to care for your pets better with carefully reviewed products.
Connect:

Thank you for reading! Have some feedback for us?


Grass Snake FAQs (Frequently Asked Questions)

The snake has a slender, long body and smooth scales. The dorsal sides are of darker colors. The ventral parts of the body have lighter colors, typically yellow.