British smooth snake venomous? Understanding the new classification and conservation implications

The article discusses a British snake, the smooth snake Coronella austriaca, being interpreted as venomous because its rear teeth are grooved and its maxilla carries a Duvernoy’s venom gland. It emphasizes that venomous does not equal dangerous to people and that the smooth snake remains harmless in human encounters. The piece situates this finding within the broader arc of snake evolution and notes that Britain has three native snakes, with the adder being the only one capable of harming humans. Given the species’ rarity and protected status, conservation messaging is important to avoid miscommunication. Author: Wolfgang Wüster (author provided).

• Venomousness is a spectrum, not a binary switch
• Smooth snakes use venom for prey, not defense against humans
• Conservation messaging matters for a rare, endangered species
• The finding ties to deep evolutionary history of rear‑fanged venom in snakes

Overview

The article examines Britain’s three native snakes, focusing on the smooth snake Coronella austriaca. A new paper by Alessandro Paterna and Grégoire Meier argues that the smooth snake should be considered venomous because its rear teeth are grooved and it possesses a Duvernoy’s venom gland. While this reclassification challenges a long-standing assumption about British snakes, the authors stress that venomous does not equate to dangerous for humans. The smooth snake is Britain’s smallest snake, rare and endangered, living on lowland heaths in southern England and benefiting from extensive conservation measures. The broader message is that venomousness and danger are not synonymous, a distinction the article repeatedly emphasizes in the context of public perception and conservation.

The spectrum of venom

The piece explains that venom evolution in snakes is not a simple on/off switch. The ancestral Caenophidia lineage carried small venom glands and grooved teeth, with diverse outcomes across lineages. Some snakes evolved full fangs and hypodermic delivery systems, others lost venom entirely, and many retained modest rear‑fanged arrangements. Seen this way, the smooth snake’s rear teeth and venom gland reflect a retained ancestral trait rather than a dramatic new development. The article situates the smooth snake’s venom system along a continuum rather than as a binary classification.

What’s really new

For biologists, the discovery is about tying up a loose end in the evolutionary narrative of venom in advanced snakes, Caenophidia. The smooth snake’s venom gland had been known for more than a century; the new paper does not rewrite the history but nudges the position of the smooth snake on the venom spectrum along. This perspective helps explain why rear‑fanged venom setups persist in some species and how these systems relate to prey capture, rather than to human danger.

Venom does not equal danger

The article reiterates that the smooth snake, like Britain’s grass snake, uses its venom apparatus to subdue small prey rather than to threaten humans. It highlights a common misperception: venomousness is not the same as being dangerous. The adder remains the sole native British species with meaningful risk to people, whereas the smooth and grass snakes could at most inflict minor scratches. The piece uses a spider analogy to illustrate that many venomous animals are not a threat to humans, underscoring the idea that humans do not need to panic about the smooth snake.

Conservation in practice

Conservationists face a PR dilemma when a native, threatened species is technically venomous. The challenge is to communicate accurately without creating unnecessary fear or stigma. The article’s takeaway is pragmatic: while venomous in a technical sense, the smooth snake remains harmless to people and pets, and conservation efforts should continue with clear messaging about actual risk.

Conclusion

The smooth snake’s venomous status adds nuance to our understanding of venom evolution but does not alter its conservation status or the public’s day‑to‑day risk. The author underscores that the broader scientific value lies in refining interpretations of venom systems across snakes, while the practical message for the public remains that the smooth snake is harmless.