Grass Snake Natrix helvetica


Class Reptilia » Order Squamata » Family Colubridae » Species Natrix helvetica (Lacépède, 1789)


Grass Snake Natrix helvetica
Attacking a frog, local canal, South Staffordshire.
6th July 2020. © Peter Hillman
Grass Snake Natrix helvetica
Attacking a frog, local canal, South Staffordshire.
6th July 2020. © Peter Hillman

A large snake with a distinct collar with two yellow patches. The body colour can vary from olive-green, grey-green, to brownish. There are vertical black bars along the flanks and two lines of alternating black dorsal spots.


Length up to 100 cm.

The Grass Snake normally hibernates underground, or in deep bracken litter. It emerges in March and normally mates in April. Eggs are laid in June, in damp, warm rotting vegetation, in clutches of 10-40. This is why it is sometimes found in gardens or allotments in compost heaps or manure piles. In August or September the eggs hatch. The snake will release a foul-smelling liquid from its anal gland if handled or if it feels threatened. It will also play dead. It can live 10-15 years.

Seen April to October. Can be seen hunting near water sources for fish and amphibians like frogs and toads. It has numerous back-facing teeth which it uses to seize and grip its prey. Usually it swallows it whole whilst still alive. Frogs and toads are usually seized from behind and swallowed back feet first.

As a superb swimmer, it is commonly found near water like ponds, lakes and canals, and also on commons, in woodland, heathland, hedgerows and gardens. Also can be seen basking in the sun amongst low vegetation.

Common throughout England and Wales, rare in northern England and Scotland, and absent from Ireland. Native to Britain.