Snakes of Europe: Venomous and Non-Venomous Species

Europe supports a compact but taxonomically varied snake fauna that includes front-fanged vipers, rear-fanged venomous snakes and many species without a medically important venom system. Under the geographic and taxonomic scope used by the 2025 European Red List of Reptiles, the European diversity table contains 46 snake taxa in six families, including 11 Viperidae. The number is not universal: a broader 2022 identification key covered 57 species plus one unresolved taxon because it used different geographic and occurrence boundaries.

Why European Snake Counts Do Not Always Match

A species total for “Europe” depends on more than taxonomy. The southeastern boundary of Europe, treatment of the Caucasus, European Türkiye, Mediterranean islands, introduced populations and records of uncertain origin can all change the total. The 2025 European Red List defines a specific European assessment region and excludes species classified as Not Applicable because they were introduced or possibly introduced after 1500 CE. Its diversity table counts 46 snake taxa across Erycidae, Colubridae, Psammophiidae, Natricidae, Typhlopidae and Viperidae. European Red List of Reptiles (2025)

The 2022 dichotomous key to European snakes used a broader reference set and included 58 taxa: 57 named species and one unnamed taxon. Its authors incorporated taxonomic revisions and newly documented allochthonous populations as well as morphology, measurements and distribution in the identification key. Di Nicola, Faraone and Zabbia (2022)

Venom in European Snakes Is Not a Two-Group System

Calling every European snake either “venomous” or “non-venomous” hides an important biological distinction. Europe has front-fanged vipers capable of medically important envenomation, but it also has rear-fanged species with venom-delivery systems that usually pose a much lower risk to people. A third group contains species for which no medically important venom system is established.

Clinical reviews of European vertebrate envenomation describe Malpolon as rear-fanged and usually of limited medical relevance, but prolonged bites have produced pain, swelling and occasional systemic neurological effects. Telescopus and Macroprotodon bites are much less often associated with human envenomation and are mainly reported with mild local effects. Clinical review of European venomous vertebrates

Europe’s 11 Vipers

Viperidae is the part of the European snake fauna most relevant to human envenomation and also the snake family carrying the highest concentration of current European conservation concern. The 2025 European assessment recognises 11 species within its regional boundary.

The familiar European adder, Vipera berus, differs biogeographically from most of the family. It reaches far into northern Europe and occupies colder environments than the Mediterranean and steppe-associated vipers. At the other extreme, species such as V. graeca and Macrovipera schweizeri have very restricted European ranges. The 2022 European snake key also illustrates why location belongs in identification: V. aspis, V. ammodytes and V. latastei have geographically structured ranges even when some external features appear superficially similar.

Rear-Fanged Venomous Snakes Outside Viperidae

Western and Eastern Montpellier Snakes

Malpolon monspessulanus and Malpolon insignitus are large, active psammophiid snakes with posterior venom-delivery teeth. The western species is associated mainly with the Iberian Peninsula, southern France and nearby western Mediterranean areas, while M. insignitus occupies southeastern European and eastern Mediterranean parts of the range. Their venom system is biologically real, but their normal human risk profile should not be equated with European vipers. Effective venom delivery generally requires a prolonged bite in which the rear teeth remain engaged.

Cat Snake

Telescopus fallax occurs in southeastern Europe and parts of the Mediterranean, including Balkan and island populations. It is rear-fanged. Clinical literature treats it as much less medically important than the European vipers, with human effects rarely reported and generally local. Its vertical pupil is useful within a full identification assessment, but pupil shape is not a safe stand-alone test for venom.

False Smooth Snakes

Macroprotodon brevis and Macroprotodon cucullatus are small rear-fanged snakes represented in southwestern European and Mediterranean populations. Their inclusion is one reason that a strict “viper versus non-venomous snake” classification is biologically incomplete. Published European clinical reviews describe effects from this group as uncommon and generally mild.

The 46-Taxon European Snake Checklist

The checklist follows the geographic logic and family composition of the 2025 European Red List diversity table, with scientific names aligned to the current European assessment and its underlying SEH taxonomy. It is a regional working checklist rather than a claim that every publication uses the same boundary. The unresolved Cyprus origin of Rhynchocalamus melanocephalus is retained explicitly rather than silently counting it as certainly native.

Five European Natrix Species, Not One “Grass Snake”

Older field literature can give the impression that the European grass snake is a single species spread across most of the continent. Current European taxonomy recognises five Natrix species. Two of the most important changes were the recognition of Natrix helvetica and Natrix astreptophora as species separate from N. natrix. This makes geography especially useful when distinguishing grass snakes.

Geography Is Part of European Snake Identification

European snakes cannot be divided safely by a single visible feature. A broad or triangular head can be produced by defensive flattening. Vertical pupils occur in some species outside Viperidae. A zigzag is useful on many vipers but varies between species and individuals, and dark melanistic snakes may obscure dorsal patterning. The European identification key therefore combines scale characters, proportions, pattern and geographic distribution rather than reducing identification to one field mark.

European Snake Diversity Is Concentrated Toward the South

The European reptile fauna shows a strong north-to-south richness gradient, with the Balkan Peninsula standing out as the richest part of the current European assessment. The Iberian, Italian and Balkan peninsulas also acted as major glacial refugia, while Mediterranean islands add isolated lineages and narrowly distributed taxa. These patterns are visible in the snake fauna rather than being a simple consequence of modern political borders.

Iberian Peninsula

Iberia contains a distinctive western assemblage that includes Vipera latastei, Vipera seoanei, Natrix astreptophora, Natrix maura, Malpolon monspessulanus, Macroprotodon brevis and several large colubrids. Some northern species overlap only part of the peninsula, producing sharp regional changes in local snake communities.

Italy and the Western-Central Transition

Italy sits between western European, Alpine and Mediterranean faunal elements. Vipera aspis, Hierophis viridiflavus, Natrix helvetica, Zamenis longissimus and the southern Italian Zamenis lineatus illustrate how continental and Mediterranean distributions meet within one peninsula.

Balkans and the Southeastern European Fauna

The Balkans combine Mediterranean scrub, river systems, open karst, forests, steppe-like habitats and high mountains. The regional fauna includes Vipera ammodytes, Hierophis gemonensis, Dolichophis caspius, Elaphe quatuorlineata, Zamenis situla, Natrix tessellata and Telescopus fallax, while mountain systems retain restricted meadow-viper populations.

Northern Europe

Species richness drops toward the north. A smaller set of cold-tolerant species reaches high latitudes, particularly Vipera berus. Depending on longitude and latitude, Coronella austriaca, grass snakes and a limited number of other species extend northward, while most Mediterranean and Balkan taxa disappear from the assemblage.

Introduced and Uncertain Records Need Separate Treatment

A snake recorded in Europe is not automatically part of the native European fauna. The 2025 assessment separates post-1500 introductions classified as Not Applicable from species included in its main European diversity table. This distinction prevents established exotic populations, isolated releases and ancient naturalised populations from being combined without context.

The Cyprus record of Rhynchocalamus melanocephalus is supported by morphological and mitochondrial evidence from two specimens reported in 2020. The original study explicitly left open whether the occurrence reflects natural colonisation or human transport. Cyprus Rhynchocalamus study

Current European Conservation Risk Is Concentrated in Vipers

The 2025 European assessment finds that six of the 11 European Viperidae species, or 54.5%, are regionally threatened. No other European snake family has species listed as threatened at the European regional level in that assessment. Vipers represent a small share of the assessed reptile fauna but a much larger share of its threatened species.

The Greek Meadow Viper shows how narrow ecological requirements can magnify risk. Research on Vipera graeca documented 17 known populations in alpine and subalpine meadows above 1,600 m in Greece and Albania, with a diet strongly centred on orthopteran insects. Its distribution is therefore tied to a small set of cold, open mountain habitats rather than to mountains in general. Greek Meadow Viper mountain study

Threats also differ among species. The European Red List identifies habitat loss, fragmentation and degradation as major pressures on reptiles, with agricultural change, development and infrastructure among the drivers. Persecution remains a recurring pressure on European snakes. Road mortality can become especially important for range-restricted populations; the current assessment cites the Cyclades Blunt-nosed Viper as a case where roadkill represented a measurable population burden before traffic restrictions were introduced during peak activity.

European Red List categories are regional assessments. A species classified as Endangered or Vulnerable in Europe should not automatically be assigned the same category at global or national scale without checking the corresponding assessment.

Snakebite Response Should Not Depend on Field Identification

A person bitten by an unidentified European snake should not spend time trying to capture it. Move away from the animal, keep the bitten person as still as practical, remove rings or other constricting items before swelling develops, immobilise the affected limb and obtain medical care promptly. A photograph may help identification only when it can be taken from a safe distance without delaying treatment.

Sources and Verification

1. European Commission — European Red List of Reptiles (2025) — Current European geographic scope, snake family totals, regional conservation categories, introduced taxa and changes since the earlier assessment.
2. Di Nicola, Faraone & Zabbia — An updated dichotomous key to the snakes of Europe (2022) — European snake identification characters, broader species coverage and geographic distribution used to distinguish similar taxa.
3. Speybroeck et al. — Species list of the European herpetofauna, 2020 update — SEH Taxonomic Committee treatment, accepted European species names and English common names forming the basis of later European assessments.
4. Di Nicola et al. — Venomous Bites, Stings and Poisoning by European Vertebrates (2023) — Clinical distinction between European front-fanged vipers and rear-fanged venomous snakes including Malpolon, Macroprotodon and Telescopus.
5. A Guide to the Clinical Management of Vipera Snakebite in Italy (2024) — Medical relevance of European vipers and context for rear-fanged species occurring within European snake assemblages.
6. Avella et al. — The biology and toxinology of blunt-nosed vipers (2025) — Distribution and current discussion of the taxonomic rank of the Cyclades/Milos viper.
7. The Reptile Database — Macrovipera lebetinus — Alternative current treatment of schweizeri at subspecies rank and associated synonymy.
8. Tamar et al. — Discovery of Rhynchocalamus melanocephalus in Cyprus (2020) — First documented Cyprus records and evidence behind the unresolved natural-versus-human-mediated origin.
9. Mizsei et al. — Greek Meadow Viper conservation study — High-elevation distribution, known population structure and specialised ecology of Vipera graeca.
10. World Health Organization — Snakebite Envenoming Treatment — First-response measures and harmful snakebite practices to avoid.