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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.
Green snake, any of several species belonging to the family Colubridae, named for their colour. The North American green snakes are the two species of the genus Opheodrys. These docile, slender, harmless snakes often live in gardens. They lay eggs, and they subsist on insects and spiders. The smooth green snake (Opheodrys vernalis), sometimes called green grass snake, is about 50 cm (20 inches) long. The rough, or keeled (ridged), green snake (O. aestivus), often called vine snake, is about 75 cm (23 inches) long.