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The grass snake is the largest species of British snake, and is identified by its olive green body and darkish spots or streaks on the flanks. However, colouration can vary. Grass snakes have a distinctive yellow and black collar behind the head and have round pupils. They can often be confused with the adder which has a more thick-set body and a distinct zigzag down its back, and it also has a vertically slit pupil. The adder is venomous, whereas the grass snake is not.
Grass snake. Reaching nearly two metres, grass snakes are the UK's largest reptile and our only snake to lay eggs. A grass snake's speed and wariness makes it incredibly difficult to spot, but once cornered it is one of the few animals that play dead as a defence against predators.he Grass snake can be found in a number of locations including: Asia, Europe, Mediterranean, Russia, United Kingdom, Wales, Ynys-hir nature reserve. Find out more about these places and what else lives there.