Great Britain has long been known to be home to just one venomous snake species, the adder. While its bites are rarely life-threatening, they can still cause serious discomfort and require a visit to the emergency room, often disrupting a person’s daily routine. The other two native British snakes, the grass snake and the smooth snake, have traditionally been considered non-venomous. This view may be changing, thanks to a recent study by herpetologists Alessandro Paterna and Grégoire Meier. The researchers suggest that the smooth snake should be reclassified as venomous. Their analysis shows that the snake has grooved teeth at the back of its upper jaw, surrounded by a layer of gum tissue—a feature commonly found in rear-fanged snakes, which can deliver small amounts of venom to their prey. The smooth snake (Coronella austriaca) is Britain’s rarest native snake, found only in lowland heaths in southern England. It is classified as endangered by the International Union for Conservation of Nature and benefits from various conservation efforts, including habitat protection and reintroduction programs. This small, elusive snake feeds on lizards, other snakes, and occasionally small mammals, and is rarely seen in the open due to its shy nature. From a biological perspective, the discovery isn’t entirely unexpected. Most of the world’s 4,000 or so snake species belong to a group called “advanced” snakes (Caenophidia), which share a common ancestor that likely had venom-producing glands and grooved teeth. Over time, different snake species evolved in various directions. Some, like vipers and cobras, developed more advanced fangs for delivering venom, while others lost their venom systems entirely. Many, however, retained a simpler form of venom delivery—small glands at the back of the mouth paired with grooved teeth. Venomousness in snakes exists on a spectrum rather than a simple on-off switch. The smooth snake, with its more specialized rear teeth and known venom glands, fits somewhere along this continuum. However, the snake remains harmless to humans, as emphasized by Paterna and Meier. In fact, many common animals, like spiders, are technically venomous, but only a few can harm humans, and their venom typically causes only mild reactions. For conservationists, the reclassification presents a public relations challenge. Most people are more concerned with whether a snake poses a threat to them or their pets than with its technical classification. The smooth snake, like the grass snake, has venom designed to subdue small prey, not larger animals like humans. Therefore, the discovery does not change the snake’s harmless nature. For the general public, the news remains largely irrelevant: the smooth snake is still not a danger, and the new findings are an interesting detail for scientists, not a cause for concern.