### Identification The Barred Grass Snake (*Natrix helvetica*) is a master of camouflage, typically sporting an olive-grey to bronzed-brown base colour. Its defining feature—and the key to distinguishing it from its cousin, *Natrix natrix*—is the series of bold, black vertical bars running down its flanks. Look for the signature "collar": a bright yellow or cream crescent immediately behind the head, bordered by a deep black patch. Unlike the venomous Adder, which has a continuous zigzag and vertical pupils, the Grass Snake has large, round pupils and smooth, keeled scales that give it a matte finish. Females are significantly more robust, occasionally reaching lengths of 120cm, while males remain slender.
### Habitat & Range This species is the quintessential "water snake" of Western Europe and the British Isles. It thrives in ecotones—the transition zones where water meets land. You will find them in damp meadows, reed beds, and garden ponds. They are rarely found far from water, as they rely on these corridors for both travel and hunting.
### Behaviour Observed in the field, they are shy and incredibly fast. On sunny mornings, look for them basking on log piles or flattened grass to raise their body temperature. If cornered, they employ a theatrical defense: thanatosis. The snake will flip onto its back, go limp, hang its tongue out, and even rupture small capillaries in its mouth to mimic a rotting corpse.
### Diet They are specialized amphibian hunters. Using a keen sense of smell (via the Jacobson’s organ), they track Common Frogs, Toads, and Newts. Unlike constrictors, they seize prey with their backward-curving teeth and swallow it alive, often while swimming.
### Fascinating Fact When the "playing dead" act isn't enough, they produce a foul-smelling secretion from their anal glands. This "musk" smells remarkably like rotting garlic and is notoriously difficult to wash off your hands!