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marsh frog
The marsh frog (''Pelophylax ridibundus'') is the largest frog native to Europe and belongs to the family of true frogs. It is very similar in appearance to the closely related edible frog and pool frog. These three species, now again in the genus ''Pelophylax'', are often referred to as "green frogs" to distinguish them from the more terrestrial European ''Rana'' species, which are known as "brown frogs" (best exemplified by the common frog ''Rana temporaria'').
==Characteristics==
The marsh frog is a water-dwelling, generally green-colored frog species. It can reach a maximum length of 17 centimetres, but males remain smaller (around 12 cm). The head is proportionally large and the hind legs are long, which gives them excellent jumping abilities.
There is a large variation in colour and pattern, ranging from dark green to brown or grey, sometimes with some lighter green lines; a lighter line on the back is generally present. The Western European populations are generally dark green to black with dark spots on the back and sides and three clear green lines on the back.
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