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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.
Adult grass snakes grow to about 80cm long, but can grow as large as 120cm long. They are a dull green / brown colour, with a cream belly and black markings-black spots and black bars are found down its sides.A lot of grass snakes have a distinctive yellow and black collar, but sometimes this is absent, especially in larger individuals.rass snakes. There is only one type of snake found in Jersey â the grass snake. The grass snake is entirely harmless and the rarest of Jerseyâs reptiles.