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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.
Names: Scientific Names: the rough green snake is Opheodrys aestivus, and the smooth green snake is Opheodrys vernalis. Common Names: these snakes are sometimes called by a variety of other names, such as grass snakes, green whip snakes, garden snakes, vine snakes, and keeled green snakes.This can lead to much confusion (for example the term grass snake is also used for the European grass snake, Natrix natrix).hese are small snakes so do not need a huge tank, but do need vertical space for climbing (even the more terrestrial smooth green snake). A 30 gallon is a good choice because it provides lots of space for greenery and hiding spots.